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

Summary:
In AArch64PromoteConstant::appendAndTransferDominatedUses,
`InsertPts[NewPt]` invalidates IPI.  Therefore, `InsertPts[NewPt] =
std::move(IPI->second)` is not legal.

This was caught by running `make check` with
http://reviews.llvm.org/D7931.

Reviewers: t.p.northover, grosbach, bkramer

Reviewed By: bkramer

Subscribers: aemerson, llvm-commits

Differential Revision: http://reviews.llvm.org/D7988

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@230923 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/AArch64/AArch64PromoteConstant.cpp b/lib/Target/AArch64/AArch64PromoteConstant.cpp
index c037c86c15264543bc73891a8be3bbf108d6ed52..4a4118ae7759a84088decfae9db19b34122046a0 100644 (file)
--- a/lib/Target/AArch64/AArch64PromoteConstant.cpp
+++ b/lib/Target/AArch64/AArch64PromoteConstant.cpp
@@ -189,9 +189,11 @@ private:
     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);
   }