[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, 9 insertions, 7 deletions

diff --git a/llgo/third_party/gofrontend/libgo/go/math/nextafter.go b/llgo/third_party/gofrontend/libgo/go/math/nextafter.go
index bbb139986aa..9088e4d248a 100644
--- a/llgo/third_party/gofrontend/libgo/go/math/nextafter.go
+++ b/llgo/third_party/gofrontend/libgo/go/math/nextafter.go
@@ -5,10 +5,11 @@
 package math
 
 // Nextafter32 returns the next representable float32 value after x towards y.
-// Special cases:
+//
+// Special cases are:
 //	Nextafter32(x, x)   = x
-//      Nextafter32(NaN, y) = NaN
-//      Nextafter32(x, NaN) = NaN
+//	Nextafter32(NaN, y) = NaN
+//	Nextafter32(x, NaN) = NaN
 func Nextafter32(x, y float32) (r float32) {
 	switch {
 	case IsNaN(float64(x)) || IsNaN(float64(y)): // special case
@@ -26,10 +27,11 @@ func Nextafter32(x, y float32) (r float32) {
 }
 
 // Nextafter returns the next representable float64 value after x towards y.
-// Special cases:
-//	Nextafter64(x, x)   = x
-//      Nextafter64(NaN, y) = NaN
-//      Nextafter64(x, NaN) = NaN
+//
+// Special cases are:
+//	Nextafter(x, x)   = x
+//	Nextafter(NaN, y) = NaN
+//	Nextafter(x, NaN) = NaN
 func Nextafter(x, y float64) (r float64) {
 	switch {
 	case IsNaN(x) || IsNaN(y): // special case