Min-Yih Hsu 36c19eae27 [TableGen] Support custom decoders for variable length instructions ...

Just like the encoder directive for variable-length instructions, this
patch adds a new decoder directive to allow custom decoder function on
an operand.

Right now, due to the design of DecoderEmitter each operand can only
have a single custom decoder in a given instruction.

Differential Revision: https://reviews.llvm.org/D142079

2023-01-24 21:59:24 -08:00

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