1. Added fast math intrinsics for single precision data types
2. Added test to check the intrinsics
3. Added HIP_PRECISE_MATH macro to enable precise math on fast math
Change-Id: Iadacbb6182c31252c5e3252854372d1b80dfd27b
[ROCm/clr commit: d9a3527769]
Aditya Atluri