Use target_impl functions to replace more inline asm

Summary:
Use target_impl functions to replace more inline asm
Follow on from D65836. Removes remaining asm shuffles and lanemask accessors
Also changes the types of target_impl bitwise functions to unsigned.

Reviewers: jdoerfert, ABataev, grokos, Hahnfeld, gregrodgers, ronlieb, hfinkel

Subscribers: openmp-commits

Tags: #openmp

Differential Revision: https://reviews.llvm.org/D66809

git-svn-id: https://llvm.org/svn/llvm-project/openmp/trunk@370216 91177308-0d34-0410-b5e6-96231b3b80d8