[Libomptarget] Remove debug definitions DeviceRTL's CMake

[jhuber6]

Summary

These debugging definitions are no longer used in the new runtime. The
old runtime has been removed since Clang-14 so we can safely get rid of
these leftover variables.

[tianshilei1992]

LG

openmp/libomptarget/DeviceRTL/CMakeLists.txt

foreach(sm ${nvptx_sm_list})
   endif()
 endforeach()
 
 set(amdgpu_mcpus gfx700 gfx701 gfx801 gfx803 gfx900 gfx902 gfx906 gfx908 gfx90a gfx90c gfx940 gfx1010 gfx1030 gfx1031 gfx1032 gfx1033 gfx1034 gfx1035 gfx1036 gfx1100 gfx1101 gfx1102 gfx1103)
 if (DEFINED LIBOMPTARGET_AMDGCN_GFXLIST)
   set(amdgpu_mcpus ${LIBOMPTARGET_AMDGCN_GFXLIST})
 endif()
 
-# Activate RTL message dumps if requested by the user.
-set(LIBOMPTARGET_DEVICE_DEBUG FALSE CACHE BOOL
-  "Activate DeviceRTL debug messages.")
-
 set(include_files
   ${include_directory}/Configuration.h
   ${include_directory}/Debug.h
   ${include_directory}/Interface.h
   ${include_directory}/LibC.h
   ${include_directory}/Mapping.h
   ${include_directory}/State.h
   ${include_directory}/Synchronization.h
set(bc_flags -c -emit-llvm -std=c++17 -fvisibility=hidden
               ${clang_opt_flags} --offload-device-only
              -nocudalib -nogpulib -nostdinc
              -fopenmp -fopenmp-cuda-mode
              -I${include_directory}
              -I${devicertl_base_directory}/../include
              ${LIBOMPTARGET_LLVM_INCLUDE_DIRS_DEVICERTL}
 )
 
-if(${LIBOMPTARGET_DEVICE_DEBUG})
-  list(APPEND bc_flags -DOMPTARGET_DEBUG=-1)
-else()
-  list(APPEND bc_flags -DOMPTARGET_DEBUG=0)
-endif()
-
 # first create an object target
 add_library(omptarget.devicertl.all_objs OBJECT IMPORTED)
 function(compileDeviceRTLLibrary target_cpu target_name target_triple)
   set(target_bc_flags ${ARGN})
 
   set(bc_files "")
   foreach(src ${src_files})
     get_filename_component(infile ${src} ABSOLUTE)