Do not run useless test variants for test-parsing/ParserSync.

test/cctest/cctest.status

Index: test/cctest/cctest.status
diff --git a/test/cctest/cctest.status b/test/cctest/cctest.status
index fe42883ffff886688e88b83bffe3330d40780813..59bf8268e988a976a351b2125d5207cb1d57244c 100644
--- a/test/cctest/cctest.status
+++ b/test/cctest/cctest.status
@@ -55,6 +55,11 @@
 
   # Boot up memory use is bloated in debug mode.
   'test-mark-compact/BootUpMemoryUse': [PASS, PASS, ['mode == debug', FAIL]],
+
+  # This tests only that the preparser and parser agree, so there is no point in
+  # running several variants. Note that this still takes ages, because there
+  # are actually 13 * 38 * 5 * 128 = 316160 individual tests hidden here.
+  'test-parsing/ParserSync': [PASS, NO_VARIANTS],
 }],  # ALWAYS
 
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