exp/ssa: fix *bsd breakage.

Use portable ReadDirent, not linux Getdents.

R=gri
TBR=gri
CC=golang-dev
https://golang.org/cl/7405051

src/pkg/exp/ssa/interp/external.go

@@ -70,7 +70,6 @@ var externals = map[string]externalFn{
 	"syscall.Close":                   ext۰syscall۰Close,
 	"syscall.Exit":                    ext۰syscall۰Exit,
 	"syscall.Fstat":                   ext۰syscall۰Fstat,
-	"syscall.Getdents":                ext۰syscall۰Getdents,
 	"syscall.Getpid":                  ext۰syscall۰Getpid,
 	"syscall.Getwd":                   ext۰syscall۰Getwd,
 	"syscall.Kill":                    ext۰syscall۰Kill,
@@ -78,6 +77,7 @@ var externals = map[string]externalFn{
 	"syscall.Open":                    ext۰syscall۰Open,
 	"syscall.ParseDirent":             ext۰syscall۰ParseDirent,
 	"syscall.Read":                    ext۰syscall۰Read,
+	"syscall.ReadDirent":              ext۰syscall۰ReadDirent,
 	"syscall.Stat":                    ext۰syscall۰Stat,
 	"syscall.Write":                   ext۰syscall۰Write,
 	"time.Sleep":                      ext۰time۰Sleep,

src/pkg/exp/ssa/interp/external_plan9.go

@@ -15,9 +15,6 @@ func ext۰syscall۰Close(fn *ssa.Function, args []value) value {
 func ext۰syscall۰Fstat(fn *ssa.Function, args []value) value {
 	panic("syscall.Fstat not yet implemented")
 }
-func ext۰syscall۰Getdents(fn *ssa.Function, args []value) value {
-	panic("syscall.Getdents not yet implemented")
-}
 func ext۰syscall۰Kill(fn *ssa.Function, args []value) value {
 	panic("syscall.Kill not yet implemented")
 }
@@ -33,6 +30,9 @@ func ext۰syscall۰ParseDirent(fn *ssa.Function, args []value) value {
 func ext۰syscall۰Read(fn *ssa.Function, args []value) value {
 	panic("syscall.Read not yet implemented")
 }
+func ext۰syscall۰ReadDirent(fn *ssa.Function, args []value) value {
+	panic("syscall.ReadDirent not yet implemented")
+}
 func ext۰syscall۰Stat(fn *ssa.Function, args []value) value {
 	panic("syscall.Stat not yet implemented")
 }

src/pkg/exp/ssa/interp/external_unix.go

@@ -54,12 +54,12 @@ func ext۰syscall۰Fstat(fn *ssa.Function, args []value) value {
 	return wrapError(err)
 }
 
-func ext۰syscall۰Getdents(fn *ssa.Function, args []value) value {
-	// func GetDents(fd int, buf []byte) (n int, err error)
+func ext۰syscall۰ReadDirent(fn *ssa.Function, args []value) value {
+	// func ReadDirent(fd int, buf []byte) (n int, err error)
 	fd := args[0].(int)
 	p := args[1].([]value)
 	b := make([]byte, len(p))
-	n, err := syscall.Getdents(fd, b)
+	n, err := syscall.ReadDirent(fd, b)
 	for i := 0; i < n; i++ {
 		p[i] = b[i]
 	}

src/pkg/exp/ssa/interp/external_windows.go

@@ -16,9 +16,6 @@ func ext۰syscall۰Close(fn *ssa.Function, args []value) value {
 func ext۰syscall۰Fstat(fn *ssa.Function, args []value) value {
 	panic("syscall.Fstat not yet implemented")
 }
-func ext۰syscall۰Getdents(fn *ssa.Function, args []value) value {
-	panic("syscall.Getdents not yet implemented")
-}
 func ext۰syscall۰Kill(fn *ssa.Function, args []value) value {
 	panic("syscall.Kill not yet implemented")
 }
@@ -34,6 +31,9 @@ func ext۰syscall۰ParseDirent(fn *ssa.Function, args []value) value {
 func ext۰syscall۰Read(fn *ssa.Function, args []value) value {
 	panic("syscall.Read not yet implemented")
 }
+func ext۰syscall۰ReadDirent(fn *ssa.Function, args []value) value {
+	panic("syscall.ReadDirent not yet implemented")
+}
 func ext۰syscall۰Stat(fn *ssa.Function, args []value) value {
 	panic("syscall.Stat not yet implemented")
 }