[llgo] Roll gofrontend forward

Switch gofrontend to using go.googlesource.com, and
update to 81eb6a3f425b2158c67ee32c0cc973a72ce9d6be.

There are various changes required to update to the
go 1.5 runtime:

typemap.go is changed to accommodate the change in representation for equal/hash algorithms, and the removal of the zero value/type.
CMakeLists.txt is updated to add the build tree to the package search path, so internal packages, which are not installed, are found.
various files changes due to removal of __go_new_nopointers; the same change as in D11863, but with NoUnwindAttribute added to the added runtime functions which are called with "callOnly".
minor cleanups in ssa.go while investigating issues with unwinding/panic handling.

Differential Revisision: http://reviews.llvm.org/D15188

llvm-svn: 263536

1 files changed, 2 insertions, 1 deletions

diff --git a/llgo/third_party/gofrontend/libgo/runtime/go-reflect-map.c b/llgo/third_party/gofrontend/libgo/runtime/go-reflect-map.c
index 58e1b34a1ea..36f31025d30 100644
--- a/llgo/third_party/gofrontend/libgo/runtime/go-reflect-map.c
+++ b/llgo/third_party/gofrontend/libgo/runtime/go-reflect-map.c
@@ -151,5 +151,6 @@ extern _Bool ismapkey (const struct __go_type_descriptor *)
 _Bool
 ismapkey (const struct __go_type_descriptor *typ)
 {
-  return typ != NULL && typ->__hashfn != __go_type_hash_error;
+  return (typ != NULL
+	  && (void *) typ->__hashfn->fn != (void *) __go_type_hash_error);
 }