Fix bogus implication from --turbo to --crankshaft.

Now that the --turbo flag is on by default, this implication makes it
impossible to disable the runtime profiler to prevent functions from
being considered hot. Essentially the --nocrankshaft flag was borked.

R=machenbach@chromium.org

Change-Id: I698008b4b69038e8bfab6d8ec3ccf57e2fd71701
Reviewed-on: https://chromium-review.googlesource.com/452619Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#43720}

src/flag-definitions.h

@@ -515,8 +515,6 @@ DEFINE_BOOL(turbo_store_elimination, true,
             "enable store-store elimination in TurboFan")
 DEFINE_BOOL(turbo_experimental, false,
             "enable crashing features, for testing purposes only")
-// TODO(turbofan): Rename --crankshaft to --optimize eventually.
-DEFINE_IMPLICATION(turbo, crankshaft)
 
 // Flags to help platform porters
 DEFINE_BOOL(minimal, false,

test/mjsunit/compiler/regress-compare-negate.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --turbo
+// Flags: --allow-natives-syntax --turbo --crankshaft
 
 function CompareNegate(a,b) {
  a = a|0;

test/mjsunit/modules-turbo1.js

@@ -3,7 +3,7 @@
 // found in the LICENSE file.
 
 // MODULE
-// Flags: --allow-natives-syntax --turbo
+// Flags: --allow-natives-syntax --turbo --crankshaft
 
 export let x = 0;
 function foo() { x++ };

test/mjsunit/shared-function-tier-up-turbo.js

@@ -3,7 +3,7 @@
 // found in the LICENSE file.
 //
 // Flags: --mark-shared-functions-for-tier-up --allow-natives-syntax
-// Flags: --ignition-staging --turbo --no-always-opt
+// Flags: --ignition-staging --turbo --crankshaft --no-always-opt
 
 // If we are always or never optimizing it is useless.
 assertFalse(isAlwaysOptimize());

test/mjsunit/strong-rooted-literals.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax --expose-gc --turbo
+// Flags: --allow-natives-syntax --expose-gc --turbo --crankshaft
 
 // Make sure literals are strongly rooted and safe from weak-code deopts.