[SWDEV 560813] Cherry-pick PR #157559 #572
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[LICM] Sink unused l-invariant loads in preheader.
Unused loop invariant loads were not sunk from preheader to exit block, increasing live range.
This commit moves the sinkUnusedInvariant logic from indvarsimplify to LICM and also adds functionality to sinks unused load that's not clobbered by loop body.