[libunwind] Don't abort if encoutering invalid .eh_frame_hdr
Recent Linux kernel release has introduced a bug as part of the ORC
rollout where the vDSO has a valid .eh_frame section, but it's missing
the .eh_frame_hdr section and GNU_EH_FRAME segment has zero size. This
causes libunwind to abort which breaks programs that use libunwind.
The other unwinder implementation (libgcc, non-gnu) instead silently
bail out unless being compiled as debug. This change modifies libunwind
to use the same strategy.
Differential Revision: https://reviews.llvm.org/D57081
llvm-svn: 352016
GitOrigin-RevId: 8c84e00c71f341d1e4bf0331f1a4b78879fe7f14
2 files changed
