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>
diff --git a/src/cmd/compile/internal/gc/bexport.go b/src/cmd/compile/internal/gc/bexport.go
index 7020902..909ff14 100644
--- a/src/cmd/compile/internal/gc/bexport.go
+++ b/src/cmd/compile/internal/gc/bexport.go
@@ -135,8 +135,8 @@
 	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),