Nikita Popov 5126c38012 [CGP] Freeze condition when despeculating ctlz/cttz ...

Freeze the condition of the newly introduced conditional branch,
to avoid immediate undefined behavior if the input to ctlz/cttz
was originally poison.

Differential Revision: https://reviews.llvm.org/D125887

2022-05-23 11:01:18 +02:00

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