cmd/compile/internal/gc: don't print "internal error" twice

The Fatalf mechanism already prints "compiler internal error:"
when reporting an error. There's no need to have "internal error"
in the error message passed to Fatalf calls. Removed them.

Fixes #28575.

Change-Id: I12b1bea37bc839780f257c27ef9e2005bf334925
Reviewed-on: https://go-review.googlesource.com/c/147287
Run-TryBot: Robert Griesemer <gri@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Martin Möhrmann <moehrmann@google.com>

src/cmd/compile/fmt_test.go

@@ -599,6 +599,7 @@ var knownFormats = map[string]string{
 	"*cmd/compile/internal/types.Type %v":             "",
 	"*cmd/internal/obj.Addr %v":                       "",
 	"*cmd/internal/obj.LSym %v":                       "",
+	"*math/big.Float %f":                              "",
 	"*math/big.Int %#x":                               "",
 	"*math/big.Int %s":                                "",
 	"*math/big.Int %v":                                "",
@@ -706,33 +707,34 @@ var knownFormats = map[string]string{
 	"interface{} %v":                                  "",
 	"map[*cmd/compile/internal/gc.Node]*cmd/compile/internal/ssa.Value %v": "",
 	"map[cmd/compile/internal/ssa.ID]uint32 %v":                            "",
-	"reflect.Type %s":  "",
-	"rune %#U":         "",
-	"rune %c":          "",
-	"string %-*s":      "",
-	"string %-16s":     "",
-	"string %-6s":      "",
-	"string %.*s":      "",
-	"string %q":        "",
-	"string %s":        "",
-	"string %v":        "",
-	"time.Duration %d": "",
-	"time.Duration %v": "",
-	"uint %04x":        "",
-	"uint %5d":         "",
-	"uint %d":          "",
-	"uint %x":          "",
-	"uint16 %d":        "",
-	"uint16 %v":        "",
-	"uint16 %x":        "",
-	"uint32 %#x":       "",
-	"uint32 %d":        "",
-	"uint32 %v":        "",
-	"uint32 %x":        "",
-	"uint64 %08x":      "",
-	"uint64 %d":        "",
-	"uint64 %x":        "",
-	"uint8 %d":         "",
-	"uint8 %x":         "",
-	"uintptr %d":       "",
+	"math/big.Accuracy %s":                                                 "",
+	"reflect.Type %s":                                                      "",
+	"rune %#U":                                                             "",
+	"rune %c":                                                              "",
+	"string %-*s":                                                          "",
+	"string %-16s":                                                         "",
+	"string %-6s":                                                          "",
+	"string %.*s":                                                          "",
+	"string %q":                                                            "",
+	"string %s":                                                            "",
+	"string %v":                                                            "",
+	"time.Duration %d":                                                     "",
+	"time.Duration %v":                                                     "",
+	"uint %04x":                                                            "",
+	"uint %5d":                                                             "",
+	"uint %d":                                                              "",
+	"uint %x":                                                              "",
+	"uint16 %d":                                                            "",
+	"uint16 %v":                                                            "",
+	"uint16 %x":                                                            "",
+	"uint32 %#x":                                                           "",
+	"uint32 %d":                                                            "",
+	"uint32 %v":                                                            "",
+	"uint32 %x":                                                            "",
+	"uint64 %08x":                                                          "",
+	"uint64 %d":                                                            "",
+	"uint64 %x":                                                            "",
+	"uint8 %d":                                                             "",
+	"uint8 %x":                                                             "",
+	"uintptr %d":                                                           "",
 }

src/cmd/compile/internal/gc/dwinl.go

@@ -300,7 +300,7 @@ func beginRange(calls []dwarf.InlCall, p *obj.Prog, ii int, imap map[int]int) *d
 	}
 	callIdx, found := imap[ii]
 	if !found {
-		Fatalf("internal error: can't find inlIndex %d in imap for prog at %d\n", ii, p.Pc)
+		Fatalf("can't find inlIndex %d in imap for prog at %d\n", ii, p.Pc)
 	}
 	call := &calls[callIdx]
 

src/cmd/compile/internal/gc/iexport.go

@@ -909,7 +909,7 @@ func (w *exportWriter) mpfloat(f *big.Float, typ *types.Type) {
 
 	manti, acc := mant.Int(nil)
 	if acc != big.Exact {
-		Fatalf("exporter: internal error")
+		Fatalf("mantissa scaling failed for %f (%s)", f, acc)
 	}
 	w.mpint(manti, typ)
 	if manti.Sign() != 0 {

src/cmd/compile/internal/gc/plive.go

@@ -1019,7 +1019,7 @@ func (lv *Liveness) epilogue() {
 				live := lv.livevars[index]
 				if v.Op.IsCall() && live.regs != 0 {
 					lv.printDebug()
-					v.Fatalf("internal error: %v register %s recorded as live at call", lv.fn.Func.Nname, live.regs.niceString(lv.f.Config))
+					v.Fatalf("%v register %s recorded as live at call", lv.fn.Func.Nname, live.regs.niceString(lv.f.Config))
 				}
 				index++
 			}
@@ -1038,7 +1038,7 @@ func (lv *Liveness) epilogue() {
 	// input parameters.
 	for j, n := range lv.vars {
 		if n.Class() != PPARAM && lv.stackMaps[0].Get(int32(j)) {
-			Fatalf("internal error: %v %L recorded as live on entry", lv.fn.Func.Nname, n)
+			lv.f.Fatalf("%v %L recorded as live on entry", lv.fn.Func.Nname, n)
 		}
 	}
 	// Check that no registers are live at function entry.
@@ -1047,7 +1047,7 @@ func (lv *Liveness) epilogue() {
 	// so it doesn't appear live at entry.
 	if regs := lv.regMaps[0]; regs != 0 {
 		lv.printDebug()
-		lv.f.Fatalf("internal error: %v register %s recorded as live on entry", lv.fn.Func.Nname, regs.niceString(lv.f.Config))
+		lv.f.Fatalf("%v register %s recorded as live on entry", lv.fn.Func.Nname, regs.niceString(lv.f.Config))
 	}
 }