Do not propagate RHS flags in block morphing #66291
Merged
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It is not necessary to copy flags from the source node to the field nodes when doing a field-by-field copy in block morphing. In fact, it can be a pessimization in cases where the source node had NO_CSE set, which would block constant propagation.
Broadly good diffs, with a couple size regressions due to said constant propagation not always being better.