[compiler-rt sanitizer] Use our own PTRACE_GETREGSET if it does not exist.

On RH66 does not support 'PTRACE_GETREGSET'. This change makes this part of compiler-rt build again on older os-es

Reviewed By: vitalybuka

Differential Revision: https://reviews.llvm.org/D91686

GitOrigin-RevId: 8d33f08844a171472a59ef3f1ea6edb1e9fb9843
1 file changed