testsuite: bump MultiLayerModulesDefsGhciReload timeout to 10x

(cherry picked from commit e17f2df9)

testsuite/tests/perf/compiler/all.T

@@ -400,7 +400,7 @@ test('MultiLayerModulesDefsGhciReload',
      [ collect_compiler_residency(15),
        pre_cmd('./genMultiLayerModulesDefs'),
        extra_files(['genMultiLayerModulesDefs']),
-       compile_timeout_multiplier(5)
+       compile_timeout_multiplier(10)
        # this is _a lot_
        # but this test has been failing every now and then,
        # especially on i386. Let's just give it some room