[x86] Initialize a pointer to null to fix a bug in r212602.

This should restore GCC hosts (which happen to put the bad stuff into
the pointer) and MSan, etc.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212606 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index daf141bfcec181bdab2f4ba954acd5593b870ed1..188a0befcbdbc34414f09a3fdfc4c564aa9d2218 100644 (file)
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -20385,7 +20385,7 @@ static SDValue WidenMaskArithmetic(SDNode *N, SelectionDAG &DAG,
 
   // The right side has to be a 'trunc' or a constant vector.
   bool RHSTrunc = N1.getOpcode() == ISD::TRUNCATE;
-  ConstantSDNode *RHSConstSplat;
+  ConstantSDNode *RHSConstSplat = nullptr;
   if (auto *RHSBV = dyn_cast<BuildVectorSDNode>(N1))
     RHSConstSplat = RHSBV->getConstantSplatNode();
   if (!RHSTrunc && !RHSConstSplat)