[Benchmark X64] [Copilot] Port alternation switch optimization from source g ...

[MihuBot]

Job completed in 1 hour 35 minutes (remote runner delay: 1 minute 17 seconds).

Using arguments: benchmark Regex -NoPRLink
Main commit: dotnet/runtime@b19edc0
PR commit: dotnet/runtime@03e7c36

See benchmark results at https://gist.github.com/MihuBot/5cc713a41408431386b07832a655538f

Artifacts:

• BDN_Artifacts.zip (1 MB)
• results.md (127 KB)

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