[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, 1 deletions

diff --git a/llgo/third_party/gofrontend/libgo/go/encoding/json/scanner.go b/llgo/third_party/gofrontend/libgo/go/encoding/json/scanner.go
index a4609c89505..38d0b0802b3 100644
--- a/llgo/third_party/gofrontend/libgo/go/encoding/json/scanner.go
+++ b/llgo/third_party/gofrontend/libgo/go/encoding/json/scanner.go
@@ -38,8 +38,15 @@ func nextValue(data []byte, scan *scanner) (value, rest []byte, err error) {
 	scan.reset()
 	for i, c := range data {
 		v := scan.step(scan, int(c))
-		if v >= scanEnd {
+		if v >= scanEndObject {
 			switch v {
+			// probe the scanner with a space to determine whether we will
+			// get scanEnd on the next character. Otherwise, if the next character
+			// is not a space, scanEndTop allocates a needless error.
+			case scanEndObject, scanEndArray:
+				if scan.step(scan, ' ') == scanEnd {
+					return data[:i+1], data[i+1:], nil
+				}
 			case scanError:
 				return nil, nil, scan.err
 			case scanEnd: