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6b863256e4
This code had a homemade RAUW that was incorrect when a user was a constant: instead of calling `replaceUsersWithOnConstant()` it would incorrectly update the operand in-place, invalidating `LLVMContextImpl::ExprConstants`. RAUW does the job better. The ValueHandle that `GVMap` is holding onto needs to be removed first, so this commit also removes each variable from the map on-the-fly. Since deletions from `ExprConstants` use a linear search that compares directly on the pointer value (instead of using the key), there isn't an obvious way to expose this with a testcase. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@215953 91177308-0d34-0410-b5e6-96231b3b80d8
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