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This is primarily used for Arm64EC, but it could be used for other non-standard calling conventions. The testcase is based on an Arm64EC thunk generated by MSVC. The name save_any_reg comes from Microsoft documentation, but the full encoding isn't specified there; this is reverse-engineered from the behavior of the unwinder. (Thanks to Martin Storsjö for his example of how to write simple unwinder testcases by directly calling RtlVirtualUnwind.) Differential Revision: https://reviews.llvm.org/D135196