__asan_locate_address() does not return "stack-fake" as header suggests

In [asan_debugging.cpp](https://github.com/llvm/llvm-project/blob/05ea779fcf475b7edd7e27c11966366be1aa01f5/compiler-rt/lib/asan/asan_debugging.cpp#L80), `__asan_locate_address` does not return "stack-fake" as the header description in [asan_interface.h](https://github.com/llvm/llvm-project/blob/40c778ad1d8013db79a7adcfc2db1dcdbdde5111/compiler-rt/include/sanitizer/asan_interface.h#L188) suggests. In my experience, "stack" is returned when the "fake stack" is accessed.

Read compiler-rt/lib/asan/asan_debugging.cpp at __asan_locate_address and compare its behavior with the description in compiler-rt/include/sanitizer/asan_interface.h. Reproduce the fake-stack lookup behavior, then determine whether the implementation or header is inconsistent. Done means the returned category and documented "stack-fake" value agree.

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