ARM: Initialize the HasRAS bit.

Found by valgrind.

llvm-svn: 155313
diff --git a/llvm/lib/Target/ARM/ARMSubtarget.cpp b/llvm/lib/Target/ARM/ARMSubtarget.cpp
index e247b76..5be0d2b 100644
--- a/llvm/lib/Target/ARM/ARMSubtarget.cpp
+++ b/llvm/lib/Target/ARM/ARMSubtarget.cpp
@@ -67,6 +67,7 @@
   , HasDataBarrier(false)
   , Pref32BitThumb(false)
   , AvoidCPSRPartialUpdate(false)
+  , HasRAS(false)
   , HasMPExtension(false)
   , FPOnlySP(false)
   , AllowsUnalignedMem(false)