[OpenMP] Add tool dependencies in runtimes mode

The OpenMP offloading device runtime depends on multiple tools. We
should ensure that these tools are build before invoking the OpenMP
build.

Reviewed By: tra

Differential Revision: https://reviews.llvm.org/D147654

Author: jhuber6

llvm/runtimes/CMakeLists.txt

@@ -361,12 +361,11 @@ if(runtimes)
   # together in a single CMake invocation.
   set(extra_deps "")
   if("openmp" IN_LIST LLVM_ENABLE_RUNTIMES)
-    if(TARGET opt)
-      list(APPEND extra_deps opt)
-    endif()
-    if(TARGET llvm-link)
-      list(APPEND extra_deps llvm-link)
-    endif()
+    foreach(dep opt llvm-link llvm-extract clang clang-offload-packager)
+      if(TARGET ${dep} AND OPENMP_ENABLE_LIBOMPTARGET)
+        list(APPEND extra_deps ${dep})
+      endif()
+    endforeach()
   endif()
   if("libc" IN_LIST LLVM_ENABLE_RUNTIMES AND 
       (LLVM_LIBC_FULL_BUILD OR LIBC_GPU_BUILD OR LIBC_GPU_ARCHITECTURES))