[AArch64][AsmParser] Cleanup isSImm7s4, isSImm7s8, (etc) functions.

Reviewers: fhahn, rengolin, t.p.northover, echristo, olista01, samparker

Reviewed By: fhahn, samparker

Subscribers: samparker, aemerson, javed.absar, kristof.beyls, llvm-commits

Differential Revision: https://reviews.llvm.org/D41899

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@322481 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed