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`mrs x0, cntvct_el0` came back out of the disassembler as `mrs x0, #24322`. The 230 sysreg constants were already there and the encoding was byte-exact against llvm-mc -- the printer simply had no SYS_REG handling, so the packed 15-bit field printed as an immediate. Nothing an assembler would take back. Adds a value -> name table (sorted, binary searched) and prints that operand by name for MRS, and for the MSR form that takes one. MSR's other form holds a PSTATE field selector in the same slot, which is a different namespace; the two are told apart by whether the second operand is a register or an immediate. Six encodings carry two names, so a round-trip can come back spelled as the sibling; the first by source order wins. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018UmHLRF11EoWwNWCJ7JGaA