[NFC][TableGen] Change DecoderEmitter `insertBits` to use integer types only (#147613) The `insertBits` templated function generated by DecoderEmitter is called with variable `tmp` of type `TmpType` which is: ``` using TmpType = std::conditional_t<std::is_integral<InsnType>::value, InsnType, uint64_t>; ``` That is, `TmpType` is always an integral type. Change the generated `insertBits` to be valid only for integer types, and eliminate the unused `insertBits` function from `DecoderUInt128` in AMDGPUDisassembler.h Additionally, drop some of the requirements `InsnType` must support as they no longer seem to be required.
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