[Bug tree-optimization/120331] match causes an extra assignment sometimes

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120331

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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  Attachment #61460|0                           |1
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--- Comment #6 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Created attachment 61461
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=61461&action=edit
New patch which I am testing

We now only undo it for gimple_simplify which takes an `gimple_match_op *`
operand.