libgo patch committed: Export cgoCheck functions

libgo patch committed: Export cgoCheck functions

[Ian Lance Taylor]

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This patch to libgo exports the cgoCheck functions.  The functions
cgoCheckPointer and cgoCheckResult are called by code generated by
cgo. That means that we need to export them using go:linkname, as
otherwise they are local symbols. The cgo code currently uses weak
references to only call the symbols if they are defined, which is why
it has been working--the cgo code has not been doing any checks.
Bootstrapped and ran Go testsuite on x86_64-pc-linux-gnu.  Committed
to mainline.

Ian

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Index: gcc/go/gofrontend/MERGE
===================================================================
--- gcc/go/gofrontend/MERGE	(revision 255346)
+++ gcc/go/gofrontend/MERGE	(working copy)
@@ -1,4 +1,4 @@
-1949a203fca0c8bde6f2690ebc36427c5e3953c7
+338f7434175bb71f3c8905e9ad7f480aec3afee6
 
 The first line of this file holds the git revision number of the last
 merge done from the gofrontend repository.
Index: libgo/go/runtime/cgocall.go
===================================================================
--- libgo/go/runtime/cgocall.go	(revision 255340)
+++ libgo/go/runtime/cgocall.go	(working copy)
@@ -11,6 +11,10 @@ import (
 	"unsafe"
 )
 
+// Functions called by cgo-generated code.
+//go:linkname cgoCheckPointer runtime.cgoCheckPointer
+//go:linkname cgoCheckResult runtime.cgoCheckResult
+
 // Pointer checking for cgo code.
 
 // We want to detect all cases where a program that does not use