make/clang_darwin: Tweak CheckArches function to force the integrated-as and use
the stub SDK to try and ensure we always pick up the right archs when they
should be able to be used.
 - Also, warn when we drop an architecture.

This is a reapplication of r150232 that should stick now that we have the
integrated assembler on for ARM.

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@152057 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed