pvanhout c59f9eada1 [MCP] Optimize copies from undef ...

Revert D152502 and instead optimize away copy from undefs, but clear the undef flag on the original copy.
Apparently, not optimizing the COPY can cause performance issues in some cases.

Fixes SWDEV-405813, SWDEV-405899

Reviewed By: arsenm

Differential Revision: https://reviews.llvm.org/D153838

2023-06-29 15:12:27 +02:00

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