Implements some StrictMath functions for improved performance.

The functions ceil, floor, hypot, IEEEremainder, nextafter, and rint
have all been implemented in Java to save the native call. Benchmarking
numbers to show this performance improvement are included:

Native call (before change):
  benchmark=Ceil: 97.40 ns; σ=0.02 ns @ 3 trials
  benchmark=Floor: 98.73 ns; σ=0.02 ns @ 3 trials
  benchmark=Hypot: 714.62 ns; σ=0.44 ns @ 3 trials
  benchmark=IEEEremainder: 180.31 ns; σ=0.08 ns @ 3 trials
  benchmark=NextAfterD: 110.47 ns; σ=0.02 ns @ 3 trials
  benchmark=NextAfterF: 96.20 ns; σ=0.01 ns @ 3 trials
  benchmark=Rint: 92.21 ns; σ=0.02 ns @ 3 trials

Java implementation (after change):
  benchmark=Ceil: 47.32 ns; σ=0.01 ns @ 3 trials
  benchmark=Floor: 42.03 ns; σ=0.00 ns @ 3 trials
  benchmark=Hypot: 69.42 ns; σ=0.37 ns @ 3 trials
  benchmark=IEEEremainder: 49.64 ns; σ=0.04 ns @ 3 trials
  benchmark=NextAfterD: 63.32 ns; σ=0.17 ns @ 3 trials
  benchmark=NextAfterF: 64.67 ns; σ=0.12 ns @ 3 trials
  benchmark=Rint: 31.10 ns; σ=0.41 ns @ 10 trials

Change-Id: I9ee926514c0661cdb7a1e6ae3acfe5c31a4b9f20