clang-format: Fix import statements with ColumnLimit: 0

These used to interact badly with AlwaysBreakBeforeMultilineStrings.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@207955 91177308-0d34-0410-b5e6-96231b3b80d8
Simplify getARMCPUForMArch() and make it more consistent

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@207956 91177308-0d34-0410-b5e6-96231b3b80d8