Fix a few old-GCC warnings. No functional change.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@163309 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/ARM/ARMFastISel.cpp b/lib/Target/ARM/ARMFastISel.cpp
index 9849cb5..045d904 100644
--- a/lib/Target/ARM/ARMFastISel.cpp
+++ b/lib/Target/ARM/ARMFastISel.cpp
@@ -2642,7 +2642,7 @@
   unsigned Reg1 = getRegForValue(Src1Value);
   if (Reg1 == 0) return false;
 
-  unsigned Reg2;
+  unsigned Reg2 = 0;
   if (Opc == ARM::MOVsr) {
     Reg2 = getRegForValue(Src2Value);
     if (Reg2 == 0) return false;