[X86] Bugfix for nullptr check by klocwork

klocwork critical issues in CG files:

Patch by Xiang Zhang (xiangzhangllvm)

Differential Revision: https://reviews.llvm.org/D58363

llvm-svn: 354357

1 files changed, 2 insertions, 1 deletions

diff --git a/llvm/lib/Target/X86/X86DiscriminateMemOps.cpp b/llvm/lib/Target/X86/X86DiscriminateMemOps.cpp
index f6bd5804261..22271896f6c 100644
--- a/llvm/lib/Target/X86/X86DiscriminateMemOps.cpp
+++ b/llvm/lib/Target/X86/X86DiscriminateMemOps.cpp
@@ -85,7 +85,7 @@ bool X86DiscriminateMemOps::runOnMachineFunction(MachineFunction &MF) {
   // have any debug info.
   const DILocation *ReferenceDI =
       DILocation::get(FDI->getContext(), FDI->getLine(), 0, FDI);
-
+  assert(ReferenceDI && "ReferenceDI should not be nullptr");
   DenseMap<Location, unsigned> MemOpDiscriminators;
   MemOpDiscriminators[diToLocation(ReferenceDI)] = 0;
 
@@ -143,6 +143,7 @@ bool X86DiscriminateMemOps::runOnMachineFunction(MachineFunction &MF) {
         // Since we were able to encode, bump the MemOpDiscriminators.
         ++MemOpDiscriminators[L];
         DI = DI->cloneWithDiscriminator(EncodedDiscriminator.getValue());
+        assert(DI && "DI should not be nullptr");
         updateDebugInfo(&MI, DI);
         Changed = true;
         std::pair<DenseSet<unsigned>::iterator, bool> MustInsert =