Make compiler more acceptive wrt Isolate::use_crankshaft.

src/runtime/runtime-compiler.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #include "src/arguments.h"
 #include "src/compiler.h"
 #include "src/deoptimizer.h"
 #include "src/frames.h"
@@ skipping 29 matching lines @@
   function->ReplaceCode(*code);
   return *code;
 }
 
 
 RUNTIME_FUNCTION(Runtime_CompileOptimized) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 2);
   CONVERT_ARG_HANDLE_CHECKED(JSFunction, function, 0);
   CONVERT_BOOLEAN_ARG_CHECKED(concurrent, 1);
-  DCHECK(isolate->use_crankshaft());
 
   Compiler::ConcurrencyMode mode =
       concurrent ? Compiler::CONCURRENT : Compiler::NOT_CONCURRENT;
   Handle<Code> code;
   Handle<Code> unoptimized(function->shared()->code());
   if (Compiler::GetOptimizedCode(function, unoptimized, mode).ToHandle(&code)) {
     // Optimization succeeded, return optimized code.
     function->ReplaceCode(*code);
   } else {
     // Optimization failed, get unoptimized code.
@@ skipping 384 matching lines @@
   DCHECK(is_valid_language_mode(args.smi_at(4)));
   LanguageMode language_mode = static_cast<LanguageMode>(args.smi_at(4));
   DCHECK(args[5]->IsSmi());
   Handle<SharedFunctionInfo> outer_info(args.at<JSFunction>(2)->shared(),
                                         isolate);
   return CompileGlobalEval(isolate, args.at<String>(1), outer_info,
                            args.at<Object>(3), language_mode, args.smi_at(5));
 }
 }
 }  // namespace v8::internal