[PATCH] Fix assertion failure in global-merge with unused ConstantExpr

[Oliver Stannard]

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D10314

Files:
  llvm/trunk/lib/CodeGen/GlobalMerge.cpp

Index: llvm/trunk/lib/CodeGen/GlobalMerge.cpp
===================================================================
--- llvm/trunk/lib/CodeGen/GlobalMerge.cpp
+++ llvm/trunk/lib/CodeGen/GlobalMerge.cpp
@@ -280,6 +280,8 @@
       // users, so look through ConstantExpr...
       Use *UI, *UE;
       if (ConstantExpr *CE = dyn_cast<ConstantExpr>(U.getUser())) {
+        if (CE->use_empty())
+          continue;
         UI = &*CE->use_begin();
         UE = nullptr;
       } else if (isa<Instruction>(U.getUser())) {

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