[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, 12 insertions, 0 deletions

diff --git a/llgo/third_party/gofrontend/libgo/go/bytes/reader_test.go b/llgo/third_party/gofrontend/libgo/go/bytes/reader_test.go
index d3dce53499e..b929a282609 100644
--- a/llgo/third_party/gofrontend/libgo/go/bytes/reader_test.go
+++ b/llgo/third_party/gofrontend/libgo/go/bytes/reader_test.go
@@ -244,3 +244,15 @@ func TestReaderCopyNothing(t *testing.T) {
 		t.Errorf("behavior differs: with = %#v; without: %#v", with, withOut)
 	}
 }
+
+// tests that Len is affected by reads, but Size is not.
+func TestReaderLenSize(t *testing.T) {
+	r := NewReader([]byte("abc"))
+	io.CopyN(ioutil.Discard, r, 1)
+	if r.Len() != 2 {
+		t.Errorf("Len = %d; want 2", r.Len())
+	}
+	if r.Size() != 3 {
+		t.Errorf("Size = %d; want 3", r.Size())
+	}
+}