[CPU] Detect FPSCR exceptions in UpdateFPSCR for Rc=1 FPU instructions
Implement SNaN detection and FPSCR exception tracking so that Rc=1 FPU instructions (fadds., fmadds., etc.) correctly update CR1 with FPSCR exception summary bits (FX, FEX, VX, OX). Previously these were hardcoded to zero. Enable ~2k tests that were previously disabled.
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