[ControlHeightReduction] Drop lifetime annotations where necessary (#159686) ControlHeightReduction will duplicate some blocks and insert phi nodes in exit blocks of regions that it operates on for any live values. This includes allocas. Having a lifetime annotation refer to a phi node was made illegal in 92c55a315eab455d5fed2625fe0f61f88cb25499, which causes the verifier to fail after CHR. There are some cases where we might not need to drop lifetime annotations (usually because we do not need the phi to begin with), but drop all annotations for now to be conservative. Fixes #159621.
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