49bf74fae6
Phase 5 batch 3 (5c) — partial: targeted XX-on-inexact fixes for the float-to-int and double-to-single conversion family. (PPCBUG-180/200, the broader update_after_op XX/FR/FI rework, deferred to a focused sub-batch.) - PPCBUG-225 frspx: set XX when the f64→f32 round produces a different value (i.e. precision loss). Almost every frsp call is inexact — previously games polling FPSCR.XX never saw the set bit after a frsp. - PPCBUG-224 fcfidx: set XX when the i64 input has > 53 significant bits (precision lost in conversion to f64). - PPCBUG-229 fctidx/fctidzx: set XX when input is non-integer (fractional part discarded by the conversion). - PPCBUG-230 fctiwx/fctiwzx: same shape for word-width conversions. - PPCBUG-223 verified already correct in current code (fcmpo sets VXSNAN/VXVC on NaN operands; the audit-cited drift was already fixed). Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>