GlobalOpt: non-constexpr bitcasts or GEPs can occur even if the global value is only stored once.

Fixes PR13968.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@164815 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/IPO/GlobalOpt.cpp b/lib/Transforms/IPO/GlobalOpt.cpp
index b888e95..b1ba6be 100644
--- a/lib/Transforms/IPO/GlobalOpt.cpp
+++ b/lib/Transforms/IPO/GlobalOpt.cpp
@@ -962,7 +962,9 @@
       // If we get here we could have other crazy uses that are transitively
       // loaded.
       assert((isa<PHINode>(GlobalUser) || isa<SelectInst>(GlobalUser) ||
-              isa<ConstantExpr>(GlobalUser) || isa<CmpInst>(GlobalUser)) &&
+              isa<ConstantExpr>(GlobalUser) || isa<CmpInst>(GlobalUser) ||
+              isa<BitCastInst>(GlobalUser) ||
+              isa<GetElementPtrInst>(GlobalUser)) &&
              "Only expect load and stores!");
     }
   }