Clean up old USE_* and RELEASE.md notes.

include/hip/hcc_detail/host_defines.h

@@ -28,7 +28,6 @@ THE SOFTWARE.
 #ifndef HIP_INCLUDE_HIP_HCC_DETAIL_HOST_DEFINES_H
 #define HIP_INCLUDE_HIP_HCC_DETAIL_HOST_DEFINES_H
 
-#define USE_PROMOTE_FREE_HCC 1
 
 // Add guard to Generic Grid Launch method
 #ifndef GENERIC_GRID_LAUNCH
@@ -61,11 +60,7 @@ THE SOFTWARE.
  */
 // _restrict is supported by the compiler
 #define __shared__     tile_static
-#if USE_PROMOTE_FREE_HCC==1
 #define __constant__   __attribute__((hc))
-#else
-#define __constant__   ADDRESS_SPACE_1
-#endif
 
 #else
 // Non-HCC compiler