Change arm-windows-gnu to thumb-windows-gnu, plus some initial port work
#21174
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Windows on 32-bit Arm only operates in Thumb-2 mode: https://devblogs.microsoft.com/oldnewthing/20210601-00/?p=105267 Trying to compile for arm-windows-gnu fails in all sorts of ways as neither LLVM nor MinGW-w64 expect it.
Also remove mentions of arm and armeb; these are not relevant for Windows.
Also remove mentions of arm, armeb, thumbeb, and aarch64_be; none of these are relevant for Windows.
…NTEXT_POINTERS for thumb.
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Can compile and link a Zig hello world now, but not much else due to some relocations that LLVM's
ARMWinCOFFObjectWriterapparently can't handle. I also can't actually run the resulting binary as I don't have a Windows on Arm system. But it's at least a step in the right direction.