[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, 5 insertions, 2 deletions

diff --git a/llgo/third_party/gofrontend/libgo/go/net/sendfile_dragonfly.go b/llgo/third_party/gofrontend/libgo/go/net/sendfile_dragonfly.go
index bc88fd3b907..a9cf3fe9517 100644
--- a/llgo/third_party/gofrontend/libgo/go/net/sendfile_dragonfly.go
+++ b/llgo/third_party/gofrontend/libgo/go/net/sendfile_dragonfly.go
@@ -91,13 +91,16 @@ func sendFile(c *netFD, r io.Reader) (written int64, err error, handled bool) {
 		if err1 != nil {
 			// This includes syscall.ENOSYS (no kernel
 			// support) and syscall.EINVAL (fd types which
-			// don't implement sendfile together)
-			err = &OpError{"sendfile", c.net, c.raddr, err1}
+			// don't implement sendfile)
+			err = err1
 			break
 		}
 	}
 	if lr != nil {
 		lr.N = remain
 	}
+	if err != nil {
+		err = os.NewSyscallError("sendfile", err)
+	}
 	return written, err, written > 0
 }