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Commit a538d1f13a13 first added support for named sub-operands in CodeEmitterGen. We now add a few more features to that, enabling further target cleanups. 1. Adds support for handling an EncoderMethod in a sub-operand in CodeEmitterGen. Previously, the specified encoder of a sub-operand was ignored, and only the default used. 2. Adds support for sub-operands in DecoderEmitter, along with support for tied sub-operands. The changes to the decoder required a few minor tweaks to a few targets, where existing brokeness was exposed. In order to keep this patch small, I left FIXMEs which will be addressed in upcoming patches. (Except MIPS16, since its object file emission/decoding is totally broken). Differential Revision: https://reviews.llvm.org/D137653