Use IndexOfAnyValues in CoreLib

[MihaZupan]

Contributes to #78204

Avoids the cost of initializing the ProbabilisticMap on every matched value for ReplaceLineEndings.

Method	Toolchain	Input	Mean	Error	Ratio
ReplaceLineEndings	main	\n\n(...)\n\n [1000]	26,379.96 ns	142.148 ns	1.00
ReplaceLineEndings	pr	\n\n(...)\n\n [1000]	13,946.75 ns	49.276 ns	0.53
ReplaceLineEndings	main	aaaaa(...)aaaaa [32]	46.70 ns	0.179 ns	1.00
ReplaceLineEndings	pr	aaaaa(...)aaaaa [32]	33.29 ns	0.356 ns	0.71

---

In this case we're using "\r\n\f\u0085\u2028\u2029" as the needle.
We also have a bunch of uses of char.IsWhiteSpace where the needle likewise contains both ASCII and non-ASCII chars.

As ASCII values are more common in these cases, we could consider adding IndexOfAnyValues implementations with loops like this in the future:

while (remaining > vector256)
{
    var vector = Vector256.LoadUnsafe(...);
    if (AllCharsAreAscii(vector))
    {
        IndexOfAnyAsciiSearcher.Lookup(vector, _bitmap);
    }
    else
    {
        // Fallback to ProbabilisticMap or even IndexOfAny(char, char, char)
    }
}

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Issue Details

---

Contributes to #78204

Avoids the cost of initializing the ProbabilisticMap on every matched value for ReplaceLineEndings.

Method	Toolchain	Input	Mean	Error	Ratio
ReplaceLineEndings	main	\n\n(...)\n\n [1000]	26,379.96 ns	142.148 ns	1.00
ReplaceLineEndings	pr	\n\n(...)\n\n [1000]	13,946.75 ns	49.276 ns	0.53
ReplaceLineEndings	main	aaaaa(...)aaaaa [32]	46.70 ns	0.179 ns	1.00
ReplaceLineEndings	pr	aaaaa(...)aaaaa [32]	33.29 ns	0.356 ns	0.71

---

In this case we're using "\r\n\f\u0085\u2028\u2029" as the needle.
We also have a bunch of uses of char.IsWhiteSpace where the needle likewise contains both ASCII and non-ASCII chars.

As ASCII values are more common in these cases, we could consider adding IndexOfAnyValues implementations with loops like this in the future:

while (remaining > vector256)
{
    var vector = Vector256.LoadUnsafe(...);
    if (AllCharsAreAscii(vector))
    {
        IndexOfAnyAsciiSearcher.Lookup(vector, _bitmap);
    }
    else
    {
        // Fallback to ProbabilisticMap or even IndexOfAny(char, char, char)
    }
}

Author:	MihaZupan
Assignees:	-
Labels:	area-System.Runtime
Milestone:	8.0.0

[MihaZupan]

The checked arm64 failures are #78718