debug: x86 unwinding support, more unwinding fixes
- Fix unwindFrame using the previous FDE row instead of the current one
- Handle unwinding through noreturn functions
- Add x86-linux getcontext
- Fixup x86_64-linux getcontext not restoring the fp env
- Fix start_addr filtering on x86-windows
89ef004646kcbanner committed on 7/21/2023, 2:58:14 AMparent5cd8ab2