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clang-p2996/llvm/test/CodeGen/ARM
Sanjay Patel 2ccbf3dbd5 [SDAG] fold x * 0.0 at node creation time
In the motivating case from https://llvm.org/PR47517
we create a node that does not get constant folded
before getNegatedExpression is attempted from some
other node, and we crash.

By moving the fold into SelectionDAG::simplifyFPBinop(),
we get the constant fold sooner and avoid the problem.
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