* add default visibility to most APIs in program_state
* remove unwanted C++ headers
* Add symbol visibility pragmas and compiler flags
* Add visibility attribute to APIs in channel_descriptor and hip_hcc
* remove unused headers
* simplify build flags with hcc
* add pragma visibility hidden to functional_grid_launch
* [CMake] add gfx908 back
Don't require setting __HIP_PLATFORM_HCC__ ; Instead check if compiler is HCC.
The functions here use HCC-specific functionality so only work with HCC.
ANd they work regardless of the __HIP_PLATFORM_HCC__ setting so don't
require that.
Also remove the "hcc_detail" extra hierarchy level for hip_hcc.h as
it is not necessary. Remove hcc_detail/hip_hcc.h.
1. hipHccModuleLaunchKernel is same as hipModuleLaunchKernel with OpenCL workitem model
2. Added copy right
3. Fixed header naming
Change-Id: I6a7c35a3566e2f8d3f5056613e34193775d4b236
agunashe
Rahul Garg
Siu Chi Chan
Michael LIAO
Rahul Garg
Maneesh Gupta
Ben Sander
Aditya Atluri