[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, 7 insertions, 9 deletions

diff --git a/llgo/third_party/gofrontend/libgo/go/net/cgo_linux.go b/llgo/third_party/gofrontend/libgo/go/net/cgo_linux.go
index 0e332261acc..baf207257fa 100644
--- a/llgo/third_party/gofrontend/libgo/go/net/cgo_linux.go
+++ b/llgo/third_party/gofrontend/libgo/go/net/cgo_linux.go
@@ -12,12 +12,10 @@ package net
 
 import "syscall"
 
-func cgoAddrInfoFlags() int {
-	// NOTE(rsc): In theory there are approximately balanced
-	// arguments for and against including AI_ADDRCONFIG
-	// in the flags (it includes IPv4 results only on IPv4 systems,
-	// and similarly for IPv6), but in practice setting it causes
-	// getaddrinfo to return the wrong canonical name on Linux.
-	// So definitely leave it out.
-	return syscall.AI_CANONNAME | syscall.AI_V4MAPPED | syscall.AI_ALL
-}
+// NOTE(rsc): In theory there are approximately balanced
+// arguments for and against including AI_ADDRCONFIG
+// in the flags (it includes IPv4 results only on IPv4 systems,
+// and similarly for IPv6), but in practice setting it causes
+// getaddrinfo to return the wrong canonical name on Linux.
+// So definitely leave it out.
+const cgoAddrInfoFlags = syscall.AI_CANONNAME | syscall.AI_V4MAPPED | syscall.AI_ALL