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4cb563a01e
The previous implementations produced garbage values if the exponent did not fit within the exponent bits. See #2131 for a complete discussion, and !375 for other possible implementations. Here we implement the 4-factor version. See `pldexp_impl` in `GenericPacketMathFunctions.h` for a full description. The SSE `pcmp*` methods were moved down since `pcmp_le<Packet4i>` requires `por`. Left as a "TODO" is to delegate to a faster version if we know the exponent does fit within the exponent bits. Fixes #2131.