Mandatory/optional merging of build attributes about riscv-elf-psabi-doc HOT 5 CLOSED

64 seems like an arbitrary limit. If we want to do this it should probably follow the odd/even approach and use something like bit 1 to indicate whether it's optional (with special cases for existing attributes that don't fit that).

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.ARM.attributes uses modular arithmetic. I originally used tag < 64 (mod 128). Now I changed it to if tag%128 < 64 to make it clearer. So there is no arbitrary lower limit like 64.

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Ah I missed the (mod 128), that works (and effectively is equivalent, just uses bit 6 instead of bit 1)

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I like the general idea, it sounds like more easier to linker to handle unknown attributes :)

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Created PR for this: #360

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