MC: address some comments in deprecation checks

Bob Wilson pointed out the unnecessary checks that had been committed to the
instruction check predicates.  The check was meant to ensure that the check was
not accidentally applied to non-ARM instructions.  This is better served as an
assertion rather than a condition check.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224825 91177308-0d34-0410-b5e6-96231b3b80d8
CodeGen: Allow aliases to be overridden by variables

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224827 91177308-0d34-0410-b5e6-96231b3b80d8
CodeGen: Error on redefinitions instead of asserting

It's possible to have a prior definition of a symbol in module asm.
Raise an error instead of crashing.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224828 91177308-0d34-0410-b5e6-96231b3b80d8
Masked Load/Store - Changed the order of parameters in intrinsics.
No functional changes.
The documentation is coming.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224829 91177308-0d34-0410-b5e6-96231b3b80d8