GPU CMake: Set amdgpu-function-calls=true, in case not set by the ROCm scripts / cmake files

Author: davidrohr

dependencies/FindO2GPU.cmake

@@ -270,7 +270,7 @@ if(ENABLE_HIP)
     set(HIP_ENABLED ON)
     set_target_properties(roc::rocthrust PROPERTIES IMPORTED_GLOBAL TRUE)
     message(STATUS "HIP Found (${hip_HIPCC_EXECUTABLE} version ${hip_VERSION})")
-    set(O2_HIP_CMAKE_CXX_FLAGS "-fgpu-defer-diag -mllvm -amdgpu-enable-lower-module-lds=false -Wno-invalid-command-line-argument -Wno-unused-command-line-argument -Wno-invalid-constexpr -Wno-ignored-optimization-argument -Wno-unused-private-field -Wno-pass-failed")
+    set(O2_HIP_CMAKE_CXX_FLAGS "-fgpu-defer-diag -mllvm -amdgpu-enable-lower-module-lds=false -mllvm -amdgpu-function-calls=true -Wno-invalid-command-line-argument -Wno-unused-command-line-argument -Wno-invalid-constexpr -Wno-ignored-optimization-argument -Wno-unused-private-field -Wno-pass-failed")
     if(hip_VERSION VERSION_GREATER_EQUAL "6.0" AND NOT hip_VERSION VERSION_GREATER_EQUAL "6.2")
       set(O2_HIP_CMAKE_CXX_FLAGS "${O2_HIP_CMAKE_CXX_FLAGS} -mllvm -amdgpu-legacy-sgpr-spill-lowering=true") # TODO: Cleanup
     endif()