testsuite: Skip MultiLayerModulesTH_Make on darwin

The recent toolchain upgrade on darwin machines resulted in the
MultiLayerModulesTH_Make test metrics varying too much from the
baseline, ultimately blocking the CI pipelines.

This commit skips the test on darwin to temporarily avoid failures due
to the environment change in the runners. However, the metrics
divergence is being investigated still (tracked in #24177)

testsuite/tests/perf/compiler/all.T

@@ -361,7 +361,10 @@ test('MultiLayerModulesTH_Make',
        pre_cmd('$MAKE -s --no-print-directory MultiLayerModulesTH_Make_Prep'),
        extra_files(['genMultiLayerModulesTH']),
        unless(have_dynamic(),skip),
-       compile_timeout_multiplier(5)
+       compile_timeout_multiplier(5),
+       # We skip the test on darwin due to recent regression due to toolchain
+       # upgrade (tracked in #24177)
+       when(opsys('darwin'), skip)
      ],
      multimod_compile_fail,
      # see Note [Increased initial stack size for MultiLayerModules]