[runtimes] Make sure LLVM_LIT_ARGS is set before including individual runtimes

[ldionne]

Summary

Otherwise, the individual check-cxx, check-cxxabi and similar targets
will not know about LLVM_LIT_ARGS, and we'll end up running lit without
any argument.

[var-const]

LGTM.

[phosek]

LGTM

[mstorsjo]

LGTM, but that's odd, I'm fairly sure that I tested that this actually had effect when I added it. But maybe I didn't?

runtimes/CMakeLists.txt

if(LLVM_RUNTIMES_LIBDIR_SUBDIR)
     set(${canon_name}_LIBDIR_SUBDIR "${LLVM_RUNTIMES_LIBDIR_SUBDIR}" CACHE STRING "" FORCE)
   endif()
 
   # Setting a variable to let sub-projects detect which other projects
   # will be included under here.
   set(HAVE_${canon_name} ON)
 endforeach()
 
+if(LLVM_INCLUDE_TESTS)
+  set(LIT_ARGS_DEFAULT "-sv --show-xfail --show-unsupported")
+  if (MSVC OR XCODE)
+    set(LIT_ARGS_DEFAULT "${LIT_ARGS_DEFAULT} --no-progress-bar")
+  endif()
+  set(LLVM_LIT_ARGS "${LIT_ARGS_DEFAULT}" CACHE STRING "Default options for lit")
+endif()
+
 # We do this in two loops so that HAVE_* is set for each runtime before the
 # other runtimes are added.
 foreach(entry ${runtimes})
   get_filename_component(projName ${entry} NAME)
 
   # Between each sub-project we want to cache and clear the LIT properties
   set_property(GLOBAL PROPERTY LLVM_LIT_TESTSUITES)
   set_property(GLOBAL PROPERTY LLVM_LIT_PARAMS)
foreach(entry ${runtimes})
   list(APPEND RUNTIMES_LIT_PARAMS ${LLVM_LIT_PARAMS})
   list(APPEND RUNTIMES_LIT_DEPENDS ${LLVM_LIT_DEPENDS})
   list(APPEND RUNTIMES_LIT_EXTRA_ARGS ${LLVM_LIT_EXTRA_ARGS})
 endforeach()
 
 if(LLVM_INCLUDE_TESTS)
   # Add a global check rule now that all subdirectories have been traversed
   # and we know the total set of lit testsuites.
-
-  set(LIT_ARGS_DEFAULT "-sv --show-xfail --show-unsupported")
-  if (MSVC OR XCODE)
-    set(LIT_ARGS_DEFAULT "${LIT_ARGS_DEFAULT} --no-progress-bar")
-  endif()
-  set(LLVM_LIT_ARGS "${LIT_ARGS_DEFAULT}" CACHE STRING "Default options for lit")
-
   add_lit_target(check-runtimes
     "Running all regression tests"
     ${RUNTIMES_LIT_TESTSUITES}
     PARAMS ${RUNTIMES_LIT_PARAMS}
     DEPENDS ${RUNTIMES_LIT_DEPENDS}
     ARGS ${RUNTIMES_LIT_EXTRA_ARGS}
     )
   add_custom_target(runtimes-test-depends DEPENDS ${RUNTIMES_LIT_DEPENDS})