[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, 10 insertions, 3 deletions

diff --git a/llgo/third_party/gofrontend/libgo/go/net/udpsock.go b/llgo/third_party/gofrontend/libgo/go/net/udpsock.go
index 4c99ae4af68..9292133aeb8 100644
--- a/llgo/third_party/gofrontend/libgo/go/net/udpsock.go
+++ b/llgo/third_party/gofrontend/libgo/go/net/udpsock.go
@@ -25,7 +25,14 @@ func (a *UDPAddr) String() string {
 	return JoinHostPort(ip, itoa(a.Port))
 }
 
-func (a *UDPAddr) toAddr() Addr {
+func (a *UDPAddr) isWildcard() bool {
+	if a == nil || a.IP == nil {
+		return true
+	}
+	return a.IP.IsUnspecified()
+}
+
+func (a *UDPAddr) opAddr() Addr {
 	if a == nil {
 		return nil
 	}
@@ -46,9 +53,9 @@ func ResolveUDPAddr(net, addr string) (*UDPAddr, error) {
 	default:
 		return nil, UnknownNetworkError(net)
 	}
-	a, err := resolveInternetAddr(net, addr, noDeadline)
+	addrs, err := internetAddrList(net, addr, noDeadline)
 	if err != nil {
 		return nil, err
 	}
-	return a.toAddr().(*UDPAddr), nil
+	return addrs.first(isIPv4).(*UDPAddr), nil
 }