merged llshru into llshrs, and optimized softfloat subroutines #606
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shortShiftRightJam64, shiftRightJam64, and propagateNanF64UI are the most commonly used softfloat subroutines. They have now been implemented in assembly to reduce size and improve speed.
llshru has been moved into llshrs so it can use jr instead of jp.
I also increased the amount of ldexp tests to catch more rounding edge cases
float64_arithmetic: saved 344 bytes
float64_math: saved 211 bytes