[Runtimes] If LLVM_INCLUDE_TESTS=On depend on gtest

[beanz]

Summary

If we are building the tests for the runtimes we should make them depend on gtest so that gtest is built and ready before we run any of the check-* targets.

[beanz]

Just came to my attention this explodes on some versions of CMake. I'm looking at it and will update once I find a better approach.

[beanz]

Fixing this patch

llvm/runtimes/CMakeLists.txt

if(compiler_rt_path)
     set(deps builtins)
     # We don't need to depend on the builtins if we're building instrumented
     # because the next stage will use the same compiler used to build this stage.
     if(NOT LLVM_BUILD_INSTRUMENTED AND CLANG_ENABLE_BOOTSTRAP)
       add_dependencies(clang-bootstrap-deps builtins)
     endif()
   endif()
 
+  if(LLVM_INCLUDE_TESTS)
+    list(APPEND deps gtest_main gtest)
+  endif()
+
   # We create a list the names of all the runtime projects in all uppercase and
   # with dashes turned to underscores. This gives us the CMake variable prefixes
   # for all variables that will apply to runtimes.
   foreach(entry ${runtimes})
     get_filename_component(projName ${entry} NAME)
     string(REPLACE "-" "_" canon_name ${projName})
     string(TOUPPER ${canon_name} canon_name)
     list(APPEND prefixes ${canon_name})