Swizzle the target triple based on -mthumb, and update clang-cc to recognize
thumb-foo-bar as an ARM target.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@81497 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Basic/Targets.cpp b/lib/Basic/Targets.cpp
index 4e63db6..2cb6253 100644
--- a/lib/Basic/Targets.cpp
+++ b/lib/Basic/Targets.cpp
@@ -1558,6 +1558,7 @@
     return NULL;
 
   case llvm::Triple::arm:
+  case llvm::Triple::thumb:
     switch (os) {
     case llvm::Triple::Darwin:
       return new DarwinARMTargetInfo(T);