Fix ShouldUseClangCompiler to use llvm::Triple.
 - -1 FIXME, and fixes 'clang -arch armv4t ...', for example.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@81276 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed