[cmake][compiler-rt]why set COMPILER_RT_CRT_USE_EH_FRAME_REGISTRY default ON

[LukeSTM]

I see maskray set COMPILER_RT_CRT_USE_EH_FRAME_REGISTRY OFF
#83201

but it was reverted, and no reason
#84580

libunwind not compile __register_frame_info in default

I think this would lead to a situation where the compiler-rt's crtbegin.o file contains the __register_frame_info symbol, but libunwind does not provide it by default.

[LukeSTM]

CC @mysterymath @petrhosek

[LukeSTM]

Have you resolved the problem, or is it just reverted and no further analysis?