[clang][bytecode] Refactor `InitMapPtr` (#172665) As mentioned a few times in the past, the previous handling using a `optional<pair<bool, std::shared_ptr<>>>` was confusing and nobody ever remembered what the optional being unset meant or what the bool stood for. Add an `InitMapPtr` struct that wraps a `uintptr_t` that either holds a pointer to a valid `InitMap` instance _or_ one of two special values. The struct has meaningful accessors for the various special cases that were confusing before.
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