[AArch64] Remove redundant fmovs when bitcasting from ext/trunc of bitcast (#175983) The following can be used to reinterpret & extend a float, returning the result as a double with the upper bits cleared: return bit_cast<double>((uint64_t)bit_cast<uint32_t>(x)) this currently results in two fmovs being generated, i.e. fmov w8, s0 fmov d0, x8 ret This patch adds a pattern to improve this by using a single `fmov s0, s0` instead, and also for the case where the integer value is truncated.
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