[libunwind] [libunwind] Faster handling of frames with missed FDE records. (PR #167849)

[Daniil Kovalev via cfe-commits]

kovdan01 wrote:

> @kovdan01 , @atrosinenko - saw you in reviewers of one recent PR-s, touching this file. Could you either review, or redirect to appropriate reviewers for this change? Thank you in advance!

@ldionne Could you please take a look at the changes and/or assign appropriate reviewers? Thanks!

https://github.com/llvm/llvm-project/pull/167849