Creating release candidate final from release_600 branch

llvm-svn: 326565
llvm-svn: 326564
llvm-svn: 326563
llvm-svn: 326562
llvm-svn: 326561
llvm-svn: 326560
llvm-svn: 326559
llvm-svn: 326558
llvm-svn: 326557
llvm-svn: 326555
llvm-svn: 326554
ReleaseNotes: move the retpoline bullets higher

llvm-svn: 326550
1 file changed