[MC] Remove SectionKind from MCSection (#96067) There are only three actual uses of the section kind in MCSection: isText(), XCOFF, and WebAssembly. Store isText() in the MCSection, and store other info in the actual section variants where required. ELF and COFF flags also encode all relevant information, so for these two section variants, remove the SectionKind parameter entirely. This allows to remove the string switch (which is unnecessary and inaccurate) from createELFSectionImpl. This was introduced in [D133456](https://reviews.llvm.org/D133456), but apparently, it was never hit for non-writable sections anyway and the resulting kind was never used.
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