[CodeGen] For ad hoc aliasing, additional regUnits are needed to fix lanemask representation#139206

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vg0204 wants to merge 3 commits intollvm:mainfrom

vg0204:vg0204/handling-regunit-for-ad-hoc-aliaising

Commits on May 9, 2025

[CodeGen] For ad hoc aliasing, now each lead node register will have
vg0204
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Adding regUnit for leaf registers having aliases only once.
vg0204
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Commits on May 12, 2025

Added tableGen test cases, alongwith modified implementation to deal with aliases.
vg0204
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