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Emscripten currently implements `emscripten_return_address()` by calling out into JavaScript and parsing a stack trace, which introduces significant overhead that we would prefer to avoid in release builds. This is especially problematic for allocators because the generic parts of `std.mem.Allocator` make frequent use of `@returnAddress`, even though very few allocator implementations even observe the return address, which makes allocators nigh unusable for performance-critical applications like games if the compiler is unable to devirtualize the allocator calls.