cmd/compile/internal/gc: unexport Export

Export does not need to be exported.

Change-Id: I252f0c024732f1d056817cab13e8e3c589b54d13
Reviewed-on: https://go-review.googlesource.com/21721
Run-TryBot: Dave Cheney <dave@cheney.net>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

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

@@ -135,8 +135,8 @@ type exporter struct {
 	trace   bool
 }
 
-// Export writes the exportlist for localpkg to out and returns the number of bytes written.
-func Export(out *bio.Buf, trace bool) int {
+// export writes the exportlist for localpkg to out and returns the number of bytes written.
+func export(out *bio.Buf, trace bool) int {
 	p := exporter{
 		out:      out,
 		pkgIndex: make(map[*Pkg]int),

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

@@ -385,7 +385,7 @@ func dumpexport() {
 			// save a copy of the export data
 			var copy bytes.Buffer
 			bcopy := bio.BufWriter(&copy)
-			size = Export(bcopy, Debug_export != 0)
+			size = export(bcopy, Debug_export != 0)
 			bcopy.Flush() // flushing to bytes.Buffer cannot fail
 			if n, err := bout.Write(copy.Bytes()); n != size || err != nil {
 				Fatalf("error writing export data: got %d bytes, want %d bytes, err = %v", n, size, err)
@@ -407,7 +407,7 @@ func dumpexport() {
 			pkgs = savedPkgs
 			pkgMap = savedPkgMap
 		} else {
-			size = Export(bout, Debug_export != 0)
+			size = export(bout, Debug_export != 0)
 		}
 		exportf("\n$$\n")
 	} else {