cmd/internal/obj: implement Dconv for TYPE_INDIR

It was just missing, and apparently always was.

Change-Id: I84c057bb0ec72940201075f3e6078262fe4bce05
Reviewed-on: https://go-review.googlesource.com/6120Reviewed-by: Russ Cox <rsc@golang.org>

src/cmd/asm/internal/asm/operand_test.go

@@ -245,7 +245,7 @@ var x86OperandTests = []operandTest{
 	{"(BX)", "(BX)"},
 	{"(SP)", "(SP)"},
 	{"*AX", "AX"}, // TODO: Should make * illegal here; a simple alias for JMP AX.
-	{"*runtime·_GetStdHandle(SB)", "type=16"}, // TODO: bizarre
+	{"*runtime·_GetStdHandle(SB)", "*runtime._GetStdHandle(SB)"},
 	{"-(4+12)(DI)", "-16(DI)"},
 	{"-1(DI)(BX*1)", "-1(DI)(BX*1)"},
 	{"-96(DI)(BX*1)", "-96(DI)(BX*1)"},

src/cmd/asm/internal/asm/testdata/386.out

@@ -17,7 +17,7 @@
 32 00017 (testdata/386.s:32)	JCS	,16(PC)
 35 00018 (testdata/386.s:35)	CALL	,AX
 36 00019 (testdata/386.s:36)	JMP	,AX
-37 00020 (testdata/386.s:37)	CALL	,type=16
+37 00020 (testdata/386.s:37)	CALL	,*foo(SB)
 38 00021 (testdata/386.s:38)	JMP	,$4
 39 00022 (testdata/386.s:39)	JMP	,16
 40 00023 (testdata/386.s:40)	CALL	,foo(SB)

src/cmd/internal/obj/util.go

@@ -312,6 +312,9 @@ func Dconv(p *Prog, Rconv func(int) string, a *Addr) string {
 			str = fmt.Sprintf("%d(PC)", a.Offset)
 		}
 
+	case TYPE_INDIR:
+		str = fmt.Sprintf("*%s", Mconv(Rconv, a))
+
 	case TYPE_MEM:
 		str = Mconv(Rconv, a)
 		if a.Index != REG_NONE {