opcodes: Make flushing denormals the default behavior
Flushing denormals is a better default behavior for SIMD engines, since they tend handle denormals slowly (SSE, Altivec) or not at all (NEON). Unfortunately, that behavior is expensive to emulate on IEEE-compliant FPUs, since you need to check for denormal before and after every operation. At this point, the emulator flushes denormals and C code does not.
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