[VPlan] Replace VPRegionBlock with explicit CFG before execute (NFCI).#117506
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[VPlan] Replace VPRegionBlock with explicit CFG before execute (NFCI).#117506
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Building on top of #114305,
replace VPRegionBlocks with explicit CFG before executing.
This will enable further simplifications of phi handling during execution
and transformations that do not have to preserve the canonical IV required
by loop regions. This for example could include replacing the canonical
IV with an EVL based phi while completely removing the original canonical
IV.