[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, 0 deletions

diff --git a/llgo/third_party/gofrontend/libgo/go/net/http/header.go b/llgo/third_party/gofrontend/libgo/go/net/http/header.go
index 153b94370f8..d847b131184 100644
--- a/llgo/third_party/gofrontend/libgo/go/net/http/header.go
+++ b/llgo/third_party/gofrontend/libgo/go/net/http/header.go
@@ -168,6 +168,8 @@ func (h Header) WriteSubset(w io.Writer, exclude map[string]bool) error {
 // letter and any letter following a hyphen to upper case;
 // the rest are converted to lowercase.  For example, the
 // canonical key for "accept-encoding" is "Accept-Encoding".
+// If s contains a space or invalid header field bytes, it is
+// returned without modifications.
 func CanonicalHeaderKey(s string) string { return textproto.CanonicalMIMEHeaderKey(s) }
 
 // hasToken reports whether token appears with v, ASCII