[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(LLVM_INCLUDE_TESTS)
           count
           llvm-nm
           llvm-objdump
           llvm-xray
           not
           obj2yaml
           sancov
           sanstats
+          gtest_main
+          gtest
         )
       foreach(target ${test_targets} ${SUB_CHECK_TARGETS})
         add_dependencies(${target} ${RUNTIMES_TEST_DEPENDS})
       endforeach()
     endif()
   endif()
 endif()