[libcxx-commits] [libcxxabi] [libc++abi] Fix lpStart adjustment for exceptions table (PR #72727)

[Shoaib Meenai via libcxx-commits]

smeenai wrote:

@MaskRay is probably most familiar with this, but as far as I can tell from the DWARF spec and https://www.airs.com/blog/archives/464, this is correct (and matches libsupc++, as the issue mentions). It seems like a general deficiency of `readEncodedPointer` that it doesn't distinguish between `DW_EH_PE_omit` and an actual encoded value of zero; idk if that can affect more places as well.

https://github.com/llvm/llvm-project/pull/72727