[interpreter] Introduce --ignition-staging flag.

This flag is aiming at shipping the ability to generate optimized code
directly from bytecode (without re-parsing source code). All features
needed to ship such a configuration will be staged behind this flag.

R=hablich@chromium.org,rmcilroy@chromium.org

Review-Url: https://codereview.chromium.org/2174333002
Cr-Commit-Position: refs/heads/master@{#38040}

src/flag-definitions.h

@@ -296,6 +296,10 @@ DEFINE_BOOL(string_slices, true, "use string slices")
 
 // Flags for Ignition.
 DEFINE_BOOL(ignition, false, "use ignition interpreter")
+DEFINE_BOOL(ignition_staging, false, "use ignition with all staged features")
+DEFINE_IMPLICATION(ignition_staging, ignition)
+DEFINE_IMPLICATION(ignition_staging, ignition_osr)
+DEFINE_IMPLICATION(ignition_staging, turbo_from_bytecode)
 DEFINE_BOOL(ignition_eager, false, "eagerly compile and parse with ignition")
 DEFINE_STRING(ignition_filter, "*", "filter for ignition interpreter")
 DEFINE_BOOL(ignition_deadcode, true,

tools/testrunner/local/testsuite.py

@@ -42,7 +42,7 @@ ALL_VARIANT_FLAGS = {
   "turbofan_opt": [["--turbo", "--always-opt"]],
   "nocrankshaft": [["--nocrankshaft"]],
   "ignition": [["--ignition"]],
-  "ignition_turbofan": [["--ignition", "--turbo", "--turbo-from-bytecode"]],
+  "ignition_turbofan": [["--ignition-staging", "--turbo"]],
   "preparser": [["--min-preparse-length=0"]],
 }
 
@@ -53,7 +53,7 @@ FAST_VARIANT_FLAGS = {
   "turbofan": [["--turbo"]],
   "nocrankshaft": [["--nocrankshaft"]],
   "ignition": [["--ignition"]],
-  "ignition_turbofan": [["--ignition", "--turbo", "--turbo-from-bytecode"]],
+  "ignition_turbofan": [["--ignition-staging", "--turbo"]],
   "preparser": [["--min-preparse-length=0"]],
 }