[RISCV] Don't crash if parseNormalizedArchString encounters a multi-letter extension with an unknown prefix. (#91398)

The sorting code previously asserted if a prefix was multiple letters,
but didn

[RISCV] Don't crash if parseNormalizedArchString encounters a multi-letter extension with an unknown prefix. (#91398)

The sorting code previously asserted if a prefix was multiple letters,
but didn't start with s, x, or z.

Replace the assert with an explicit check and sort the multi-letter
extension after the known multi-letter prefixes.

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[RISCV] Add partial validation of Z extension name to RISCVISAInfo::parseNormalizedArchString (#90895)

If 'z' is given as the complete extension name or with a digit after it,
it will crash in the

[RISCV] Add partial validation of Z extension name to RISCVISAInfo::parseNormalizedArchString (#90895)

If 'z' is given as the complete extension name or with a digit after it,
it will crash in the extension map compare function. Check for these
cases and give an error.

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[RISCV] Split code that tablegen needs out of RISCVISAInfo. (#89684)

This introduces a new file, RISCVISAUtils.cpp and moves the rest of
RISCVISAInfo to the TargetParser library.

This will allow

[RISCV] Split code that tablegen needs out of RISCVISAInfo. (#89684)

This introduces a new file, RISCVISAUtils.cpp and moves the rest of
RISCVISAInfo to the TargetParser library.

This will allow us to generate part of RISCVISAInfo.cpp using tablegen.

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