[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, 7 insertions, 0 deletions

diff --git a/llgo/third_party/gofrontend/libgo/go/cmd/gofmt/doc.go b/llgo/third_party/gofrontend/libgo/go/cmd/gofmt/doc.go
index 3fc0439548f..9d0cd328623 100644
--- a/llgo/third_party/gofrontend/libgo/go/cmd/gofmt/doc.go
+++ b/llgo/third_party/gofrontend/libgo/go/cmd/gofmt/doc.go
@@ -87,6 +87,13 @@ When invoked with -s gofmt will make the following source transformations where
 		for x, _ = range v {...}
 	will be simplified to:
 		for x = range v {...}
+
+	A range of the form:
+		for _ = range v {...}
+	will be simplified to:
+		for range v {...}
+
+This may result in changes that are incompatible with earlier versions of Go.
 */
 package main