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5761c23ba4
SHRN/2, RSHRN/2, SQSHRN/2, UQSHRN/2, SQRSHRN/2, UQRSHRN/2, SQSHRUN/2,
SQRSHRUN/2 (16 forms). Verified against llvm-mc that immh keys on the
NARROW destination element (not the wide source), so the existing
NEON_SHR_IMM encoder/decoder (esize from ops[0]) is already correct --
this is a specgen-only change: right-shift esize now uses ESIZE[dst]
(equal to ESIZE[src] for same-arrangement shifts) plus narrowing
{narrow-dst, wide-src} arrangement tuples. All forms byte-exact and
decode-roundtrip verified across B/H/S element sizes; 461 tests green.