Include a fix and two supporting patches from LLVM 11 to fix problems
with double registration while both clang-cpp and llvm lib are linked
(like in case of opencl-clang).
| CommandLine Error: Option 'mc-relax-all' registered more than once!
| LLVM ERROR: inconsistency in registered CommandLine options
Signed-off-by: Anuj Mittal <anuj.mittal@intel.com>
