Run all message tests with a variant that forces preparsing

tools/testrunner/local/testsuite.py

Index: tools/testrunner/local/testsuite.py
diff --git a/tools/testrunner/local/testsuite.py b/tools/testrunner/local/testsuite.py
index 449a65aa136ee650f3090f1824c9ba439502f54e..18ec17f4a4304a4f0bf3b134a93a0ba59d3a79df 100644
--- a/tools/testrunner/local/testsuite.py
+++ b/tools/testrunner/local/testsuite.py
@@ -44,6 +44,7 @@ ALL_VARIANT_FLAGS = {
   "ignition": [["--ignition", "--ignition-filter=*",
                 "--ignition-fake-try-catch",
                 "--ignition-fallback-on-eval-and-catch"]],
+  "preparser": [["--min-preparse-length=0"]],
 }
 
 # FAST_VARIANTS implies no --always-opt.
@@ -55,10 +56,11 @@ FAST_VARIANT_FLAGS = {
   "ignition": [["--ignition", "--ignition-filter=*",
                 "--ignition-fake-try-catch",
                 "--ignition-fallback-on-eval-and-catch"]],
+  "preparser": [["--min-preparse-length=0"]],
 }
 
 ALL_VARIANTS = set(["default", "stress", "turbofan", "turbofan_opt",
-                    "nocrankshaft", "ignition"])
+                    "nocrankshaft", "ignition", "preparser"])
 FAST_VARIANTS = set(["default", "turbofan"])
 STANDARD_VARIANT = set(["default"])