Remove static id from VirtualStackSlot.
SimpleStackSlotAllocator: use an array instead of a HashMap.
Compare compressed flag in HotSpotObjectConstantImpl#equals and reference equality in HotSpotConstantReflectionProvider#constantEquals
Add support for stable array constants
Refactor PartialEvaluatorCanonicalizer into custom ConstantReflectionProvider
Remove CustomCanonicalizer
Backed out changeset 42854d32b658