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.
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.

git-svn-id: c199f293c43da69278bea8e88f92242bf3aa95f7@150232 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt