[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, 3 insertions, 0 deletions

diff --git a/llgo/third_party/gofrontend/libgo/go/math/rand/rand.go b/llgo/third_party/gofrontend/libgo/go/math/rand/rand.go
index 3ffb5c4e5c6..6360128e391 100644
--- a/llgo/third_party/gofrontend/libgo/go/math/rand/rand.go
+++ b/llgo/third_party/gofrontend/libgo/go/math/rand/rand.go
@@ -9,6 +9,9 @@
 // sequence of values each time a program is run. Use the Seed function to
 // initialize the default Source if different behavior is required for each run.
 // The default Source is safe for concurrent use by multiple goroutines.
+//
+// For random numbers suitable for security-sensitive work, see the crypto/rand
+// package.
 package rand
 
 import "sync"