506ca19dc9
Summary: This is going to be deprecated in https://github.com/llvm/llvm-project/pull/112849. This patch ports it to use the builtin instead. This isn't a compile constant, so it could slightly negatively affect codegen. There really should be an IR pass to turn it into a constant if the function has known attributes. Using the builtin is correct when we just do it for knowing the size like we do here. Obviously guarding w32/w64 code with this check would be broken.
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