[llvm] [FIX] Fix undefined-behaviour in regex engine. (PR #73071)

[David Blaikie via llvm-commits]

dwblaikie wrote:

> @dwblaikie In regengine.inc (line 152), we use the start and end (both 0 here) 

Oh, is it that null+0 is UB? I guess that's fair... Hmm :/



https://github.com/llvm/llvm-project/pull/73071