[Flags] The Future is --turbo, and --turbo implies --ignition-staging.

src/flag-definitions.h

Index: src/flag-definitions.h
diff --git a/src/flag-definitions.h b/src/flag-definitions.h
index 7a4ebb066ce39304a54f7470df3d7f84a1979800..e3390ee3d4751f07e53cac48d7c0f228b32c06ea 100644
--- a/src/flag-definitions.h
+++ b/src/flag-definitions.h
@@ -258,7 +258,16 @@ HARMONY_SHIPPING(FLAG_SHIPPING_FEATURES)
 DEFINE_BOOL(future, false,
             "Implies all staged features that we want to ship in the "
             "not-too-far future")
-DEFINE_IMPLICATION(future, ignition_staging)
+DEFINE_IMPLICATION(future, turbo)
+
+DEFINE_IMPLICATION(turbo, ignition_staging)
+
+// TODO(rmcilroy): Remove ignition-staging and set these implications directly
+// with the turbo flag.
+DEFINE_BOOL(ignition_staging, false, "use ignition with all staged features")
+DEFINE_IMPLICATION(ignition_staging, ignition)
+DEFINE_IMPLICATION(ignition_staging, compiler_dispatcher)
+DEFINE_IMPLICATION(ignition_staging, validate_asm)
 
 // Flags for experimental implementation features.
 DEFINE_BOOL(allocation_site_pretenuring, true,
@@ -300,9 +309,6 @@ 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, compiler_dispatcher)
 DEFINE_STRING(ignition_filter, "*", "filter for ignition interpreter")
 DEFINE_BOOL(ignition_deadcode, true,
             "use ignition dead code elimination optimizer")
@@ -520,7 +526,6 @@ DEFINE_BOOL(wasm_loop_assignment_analysis, true,
             "perform loop assignment analysis for WASM")
 
 DEFINE_BOOL(validate_asm, false, "validate asm.js modules before compiling")
-DEFINE_IMPLICATION(ignition_staging, validate_asm)
 DEFINE_BOOL(suppress_asm_messages, false,
             "don't emit asm.js related messages (for golden file testing)")
 DEFINE_BOOL(trace_asm_time, false, "log asm.js timing info to the console")