Rename attribute 'thumb' to a more descriptive 'thumb-mode'.

llvm-svn: 134626
diff --git a/llvm/lib/Target/ARM/ARM.td b/llvm/lib/Target/ARM/ARM.td
index 54a8e98..cf333cc 100644
--- a/llvm/lib/Target/ARM/ARM.td
+++ b/llvm/lib/Target/ARM/ARM.td
@@ -20,7 +20,7 @@
 // ARM Subtarget state.
 //
 
-def ModeThumb  : SubtargetFeature<"thumb", "IsThumb", "true",
+def ModeThumb  : SubtargetFeature<"thumb-mode", "InThumbMode", "true",
                                   "Thumb mode">;
 
 //===----------------------------------------------------------------------===//