Avoid a warning "'U' might be used uninitialized in
this function" when using a not-too-smart compiler.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72768 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86FastISel.cpp b/lib/Target/X86/X86FastISel.cpp
index b3667be..33332e4 100644
--- a/lib/Target/X86/X86FastISel.cpp
+++ b/lib/Target/X86/X86FastISel.cpp
@@ -321,7 +321,7 @@
 /// X86SelectAddress - Attempt to fill in an address from the given value.
 ///
 bool X86FastISel::X86SelectAddress(Value *V, X86AddressMode &AM, bool isCall) {
-  User *U;
+  User *U = NULL;
   unsigned Opcode = Instruction::UserOp1;
   if (Instruction *I = dyn_cast<Instruction>(V)) {
     Opcode = I->getOpcode();