[libunwind] [libunwind] Fix execution flow imbalance when using C++ Exceptions (PR #165066)

[Med Ismail Bennani via cfe-commits]

medismailben wrote:

@ojhunt I've addressed your comments.

> Ugh, I just checked and it looks like the codegen is wrong so assembly it will have to be, but that will at least not be templates. Will write it later. Gnah.

Any update on this approach ?

https://github.com/llvm/llvm-project/pull/165066