[JitDiff X64] [EgorBo] Unroll SpanHelpers.SequenceEqual in a late phase

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Job completed in 20 minutes.
dotnet/runtime#108808

Artifacts:

• build-clr-checked-main.zip (94 MB)
• build-artifacts-main.zip (691 MB)
• build-clr-checked-pr.zip (94 MB)
• build-artifacts-pr.zip (693 MB)
• jit-diffs-pr.zip (111 MB)
• jit-diffs-main.zip (117 MB)

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