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4e890ca658
Currently, there doesn't seem to be any way to look up a Value* in a map/set indexed by AssertingVH/PoisoningVH, without creating a value handle -- which is fairly expensive, because it involves adding the value handle to the use list and immediately removing it again. Using find_as(Value *) does not work (and is in fact worse than just using find(Value *)), because it will end up creating multiple value handles during the lookup itself. For AssertingVH, address this by simply using DenseMapInfo<T *> instead of manually implementing something. The AssertingVH<T> will now get coerced to T*, rather than the other way around. For PoisoningVH, add extra overloads of getHashValue() and isEqual() that accept a T* argument. This allows using find_as(Value *) to perform efficient lookups in assertion-enabled builds. Differential Revision: https://reviews.llvm.org/D81793