Remove duplicated compiler symbols from hip-rt. hip-rt should use symbols such as EF_AMDGPU_MACH_AMDGCN_XXX and
ELFABIVERSION_AMDGPU_HSA_VX defined in compiler header.
[ROCm/clr commit: b15c1657b8]
1) Add Linker APIs to runtime to support SPIRV linking
2) Migrate Internal implementations to runtime and share with rtc
3) Add Support to bundled and unbundled SPIRV Code object linking.
Change-Id: Ic1fd4431f842a208a2468e8aec54a65b5fa6b0e3
[ROCm/clr commit: 5930f047bb]
Sang, Tao
Betigeri, Sourabh
Branislav Brzak
Rahul Manocha