[Interpreter] Prepare switching to new ignition testing variant.

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 f43d008b220bc5baa06d9ef04b42d3bdc799f6a9..1771fc4f2f3ca8ea3b6acfb5e4e646b7ecfbe280 100644
--- a/tools/testrunner/local/testsuite.py
+++ b/tools/testrunner/local/testsuite.py
@@ -42,6 +42,7 @@ ALL_VARIANT_FLAGS = {
   "turbofan_opt": [["--turbo", "--always-opt"]],
   "nocrankshaft": [["--nocrankshaft"]],
   "ignition": [["--ignition", "--turbo"]],
+  "ignition_turbofan": [["--ignition", "--turbo"]],
   "preparser": [["--min-preparse-length=0"]],
 }
 
@@ -52,11 +53,13 @@ FAST_VARIANT_FLAGS = {
   "turbofan": [["--turbo"]],
   "nocrankshaft": [["--nocrankshaft"]],
   "ignition": [["--ignition", "--turbo"]],
+  "ignition_turbofan": [["--ignition", "--turbo"]],
   "preparser": [["--min-preparse-length=0"]],
 }
 
 ALL_VARIANTS = set(["default", "stress", "turbofan", "turbofan_opt",
-                    "nocrankshaft", "ignition", "preparser"])
+                    "nocrankshaft", "ignition", "ignition_turbofan",
+                    "preparser"])
 FAST_VARIANTS = set(["default", "turbofan"])
 STANDARD_VARIANT = set(["default"])