[PATCH] [SelectionDAG] Fix PR23603.

[hfinkel at anl.gov]

LGTM.


================
Comment at: lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp:2851
@@ -2850,2 +2850,3 @@
   bool isNonTemporal = I.getMetadata(LLVMContext::MD_nontemporal) != nullptr;
-  bool isInvariant = I.getMetadata(LLVMContext::MD_invariant_load) != nullptr;
+  bool isInvariant = I.getMetadata(LLVMContext::MD_invariant_load) != nullptr &&
+    isDereferenceablePointer(SV, *DAG.getTarget().getDataLayout());
----------------
Please add a comment here explaining why the dereferenceability check is needed.

http://reviews.llvm.org/D10075

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