1. Use -DHIP_FAST_MATH to make precise math functions compiled to fast math
2. Added double fast math functions for sqrt
3. Changed hipcc to parse -use_fast_math (not working)
4. Added passed tag to hipFloatMath test
Change-Id: I72884b2436b4efe61e9a9297346c1358fee38a2d
[ROCm/hip commit: 043da795f6]
Aditya Atluri