[asan] Support outline instrumentation for wide types and delete dead code, patch by Yuri Gribov 

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@206883 91177308-0d34-0410-b5e6-96231b3b80d8
[AVX512] Implemented integer conversions up/down with masking.
Added encoding tests.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@206884 91177308-0d34-0410-b5e6-96231b3b80d8