[Thumb] Clang thinks "char" is signed when using a thumb triple

'char' is unsigned on all ARM and Thumb architectures. Clang gets this
right for ARM, and for thumb when using and arm triple and the -mthumb
option, but gets it wrong for thumb triples. This fixes that.

llvm-svn: 220555
diff --git a/clang/lib/Driver/Tools.cpp b/clang/lib/Driver/Tools.cpp
index e34fd5c..fb2485d 100644
--- a/clang/lib/Driver/Tools.cpp
+++ b/clang/lib/Driver/Tools.cpp
@@ -459,6 +459,8 @@
   case llvm::Triple::aarch64_be:
   case llvm::Triple::arm:
   case llvm::Triple::armeb:
+  case llvm::Triple::thumb:
+  case llvm::Triple::thumbeb:
     if (Triple.isOSDarwin() || Triple.isOSWindows())
       return true;
     return false;