[ARM] The ARM backend is MachineVerifier clean now.

Summary: Thanks everyone involved in fixing the outstanding issues.

Reviewers: rovka, MatzeB, efriedma

Reviewed By: MatzeB

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

Differential Revision: https://reviews.llvm.org/D36153

llvm-svn: 310180