Update to GCC 6.3.0 + fix for PR80180 New upstream release, fiddle patches to apply on it. Also apply upstream fix for rdseed/rdrand intrinsics code generation (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80180). Change-Id: Ib4dec62b4c7a537220e8755a2bc9a6a11181e000