Commits on Jul 18, 2023

1. Improve choice of IndexOfXx routine for some TryFindNextStartingPosit… …

   …ion implementations
   
   Earlier in .NET 8, we updated the Regex compiler and source generator to be able to vectorize a search for any set, not just simple ones.  When one of the main routines couldn't be used, we emit a specialized IndexOfAny helper that uses SearchValues to search for any matching ASCII character or a Unicode character, and if it encounters a Unicode character, it falls back to a linear scan.  This meant that a bunch of sets that wouldn't previously have taken these paths now do, but some of those sets have more efficient means of searching; for example, for the set `[^aA]` that searches case-insensitive for anything other than an 'A', with these scheme we'll emit a whole routine that uses SearchValues with a fallback, but we could just use IndexOfAnyExcept('A', 'a').  This fixes the compiler / source generator to prefer such helpers instead when available.

   

   stephentoub committed Jul 18, 2023
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