[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/test/Lexer/wchar-signedness.c b/clang/test/Lexer/wchar-signedness.c
index b5d4ac8..1d8bc4d 100644
--- a/clang/test/Lexer/wchar-signedness.c
+++ b/clang/test/Lexer/wchar-signedness.c
@@ -1,5 +1,6 @@
 // RUN: %clang_cc1 -fsyntax-only -dM -E %s -triple x86_64-none-linux-gnu | FileCheck %s --check-prefix=CHECK-X86
 // RUN: %clang_cc1 -fsyntax-only -dM -E %s -triple armv7-none-eabi | FileCheck %s --check-prefix=CHECK-ARM
+// RUN: %clang_cc1 -fsyntax-only -dM -E %s -triple thumbv7-none-eabi | FileCheck %s --check-prefix=CHECK-ARM
 
 // CHECK-X86-NOT: #define __WCHAR_UNSIGNED__
 // CHECK-X86: #define __WINT_UNSIGNED__ 1