[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, 8 insertions, 0 deletions

diff --git a/llgo/third_party/gofrontend/libgo/go/cmd/cgo/ast.go b/llgo/third_party/gofrontend/libgo/go/cmd/cgo/ast.go
index 10e2278a1d6..8bbd1cc52e6 100644
--- a/llgo/third_party/gofrontend/libgo/go/cmd/cgo/ast.go
+++ b/llgo/third_party/gofrontend/libgo/go/cmd/cgo/ast.go
@@ -235,9 +235,17 @@ func (f *File) saveExport(x interface{}, context string) {
 			error_(c.Pos(), "export comment has wrong name %q, want %q", name, n.Name.Name)
 		}
 
+		doc := ""
+		for _, c1 := range n.Doc.List {
+			if c1 != c {
+				doc += c1.Text + "\n"
+			}
+		}
+
 		f.ExpFunc = append(f.ExpFunc, &ExpFunc{
 			Func:    n,
 			ExpName: name,
+			Doc:     doc,
 		})
 		break
 	}