First entries of the encode-coverage effort. Adds CCMP_REG/CCMN_REG (W/X) to ENCODING_TABLE with llvm-mc-verified bit patterns; the table metaprogram regenerates the encode/decode blobs and the typed builders auto-generate (inst_ccmp_reg/inst_ccmn_reg).
Verified: encode matches llvm-mc (CCMP X1,X2,#3,EQ=0xFA420023; CCMN W5,W6,#7,NE=0x3A4610A7), decode round-trips, arm64 check+tests pass. Needs no encoder change (reuses RN/RM/NZCV_FIELD/COND_HI). The imm5 forms (immediate at bits 20:16) need a new Operand_Encoding and follow separately.
Workflow proven: llvm-mc as the encoding oracle -> SoT entry -> regen -> builder auto-generates -> verify.
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