[RyuJIT] Unroll StartsWith/SequenceEqual for ([ReadOnly]Span<char>, const-string)#46392

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EgorBo wants to merge 15 commits intodotnet:mainfrom

EgorBo:jit-intrin-memoryext-startswith

Commits on Dec 24, 2020

Optimize `span.StartsWith("cstr")` to `span.Length >= 4 && *(span._pointer) == ToHex("cstr")`
EgorBo
committed
Optimize `span.StartsWith("cstr")` to `span.Length >= 4 && *(span._pointer) == ToHex("cstr")`
EgorBo
committed

Commits on Dec 26, 2020

Fix failing tests
EgorBo
committed
Clean up
EgorBo
committed