[LLVM] adjust lit.cfg.py for Cygwin (#151416) Cygwin is like Windows in that it uses COFF, and doesn't emit .debug_frame on 64-bit architectures. However, if -elf is appended to the target triple on Cygwin MCJIT remote tests fail due to `__register_frame` not being defined. Only one test fails without -elf that succeeds with it, so mark just that test as XFAIL on Cygwin.
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