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1cfbb6358c
Avoid RAUW-ing `ConstantExpr` when an operand changes unless the new `ConstantExpr` already has users. This prevents the RAUW from rippling up the expression tree unnecessarily. This commit indirectly adds test coverage for r215953 (this is how I came across the bug). This is part of PR20515. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@215960 91177308-0d34-0410-b5e6-96231b3b80d8
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