Antonio Frighetto 7a0f75c738 Reapply "[GVN] MemorySSA for GVN: add optional AllowMemorySSA" ...

Original commit: eb63cd62a4

Previously reverted due to non-negligible compile-time impact in
stage1-ReleaseLTO-g scenario. The issue has been addressed by
always reusing previously computed MemorySSA results, and request
new ones only when `isMemorySSAEnabled` is set.

Co-authored-by: Momchil Velikov <momchil.velikov@arm.com>

2025-01-14 10:03:47 +01:00

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