FCvtWS always went to the IR interpreter. Both now convert in the
current rounding mode, which ApplyRoundingMode keeps at the game's, as
x64 does. RISC-V's FCVT already saturates and gives INT_MAX for NaN;
LoongArch patches NaN to INT_MAX like its FRound.
Co-Authored-By: Claude Opus 5.5 (1M context) <[email protected]>
Henrik RydgårdandClaude Opus 5.5
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