[OpenMP] Fix not respecting -j in additional checks

[jplehr]

Summary

This fixes that the implementation missed to pass a potentially specified
-j option to the additionally specified test targets.

It seems that libc is however not respecting this unless a previous cd
into the runtimes-build directory is done. This will be in a separate
patch.

[jplehr]

Landed in https://github.com/llvm/llvm-zorg/commit/8027f9019719ab80a72a5842470b69b5729436bd

zorg/buildbot/builders/OpenMPBuilder.py

if test:
                 description = 'test openmp',
                 workdir     = f.obj_dir,
                 env         = merged_env,
                 haltOnFailure=False,
                 flunkOnFailure=True))
     # When requested run additional lit tests
     if add_lit_checks != None:
         for add_check in add_lit_checks:
+            ninja_test_args = ['ninja', WithProperties('-j %s' % jobs)]
             f.addStep(LitTestCommand(
                 name = 'Add check ' + add_check,
-                command = ['ninja', add_check],
+                command = [ninja_test_args, add_check],
                 description = ["Additional check in OpenMP for", add_check,],
                 env = merged_env,
                 workdir = f.obj_dir,
                 haltOnFailure = False,
                 flunkOnFailure=True))
 
     clangexe = "%(builddir)s/" + llvm_builddir + "/bin/clang"
     clangxxexe = "%(builddir)s/" + llvm_builddir + "/bin/clang++"