[AArch64] Clean-up a few over-eager regexps in models.

Patch by Simon Pilgrim <llvm-dev@redking.me.uk>

That is a slightly modified version of the AArch64 changes from
Simon's D44687 .


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@328303 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed