[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, 28 insertions, 0 deletions

diff --git a/llgo/third_party/gofrontend/libgo/go/syscall/libcall_bsd.go b/llgo/third_party/gofrontend/libgo/go/syscall/libcall_bsd.go
new file mode 100644
index 00000000000..f77260854c7
--- /dev/null
+++ b/llgo/third_party/gofrontend/libgo/go/syscall/libcall_bsd.go
@@ -0,0 +1,28 @@
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// BSD library calls.
+
+package syscall
+
+import "unsafe"
+
+//sys	sendfile(outfd int, infd int, offset *Offset_t, count int) (written int, err error)
+//sendfile(outfd _C_int, infd _C_int, offset *Offset_t, count Size_t) Ssize_t
+func Sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) {
+	if raceenabled {
+		raceReleaseMerge(unsafe.Pointer(&ioSync))
+	}
+	var soff Offset_t
+	var psoff *Offset_t
+	if offset != nil {
+		soff = Offset_t(*offset)
+		psoff = &soff
+	}
+	written, err = sendfile(outfd, infd, psoff, count)
+	if offset != nil {
+		*offset = int64(soff)
+	}
+	return
+}