Implement AArch64 Neon instruction set Perm.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@194124 91177308-0d34-0410-b5e6-96231b3b80d8
Fix PR17738 - add support for vtordisp thunks when using -cxx-abi microsoft

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@194132 91177308-0d34-0410-b5e6-96231b3b80d8