[PATCH] [AArch64] fix an invalid-iterator-use bug.

[Sanjoy Das]

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D7988

Files:
  llvm/trunk/lib/Target/AArch64/AArch64PromoteConstant.cpp

Index: llvm/trunk/lib/Target/AArch64/AArch64PromoteConstant.cpp
===================================================================
--- llvm/trunk/lib/Target/AArch64/AArch64PromoteConstant.cpp
+++ llvm/trunk/lib/Target/AArch64/AArch64PromoteConstant.cpp
@@ -189,9 +189,11 @@
     IPI->second.push_back(&Use);
     // Transfer the dominated uses of IPI to NewPt
     // Inserting into the DenseMap may invalidate existing iterator.
-    // Keep a copy of the key to find the iterator to erase.
+    // Keep a copy of the key to find the iterator to erase.  Keep a copy of the
+    // value so that we don't have to dereference IPI->second.
     Instruction *OldInstr = IPI->first;
-    InsertPts[NewPt] = std::move(IPI->second);
+    Uses OldUses = std::move(IPI->second);
+    InsertPts[NewPt] = std::move(OldUses);
     // Erase IPI.
     InsertPts.erase(OldInstr);
   }

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