Creating release candidate rc4 from release_400 branch

llvm-svn: 297221
llvm-svn: 297220
llvm-svn: 297219
llvm-svn: 297218
llvm-svn: 297217
llvm-svn: 297216
llvm-svn: 297215
llvm-svn: 297214
llvm-svn: 297213
llvm-svn: 297211
llvm-svn: 297210
ReleaseNotes: fix indent

llvm-svn: 297204
1 file changed