Make mcpu=generic the default for armv7-a and armv8-a.

As discussed in
http://lists.llvm.org/pipermail/llvm-dev/2017-May/113525.html


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@304390 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed