Introduce LanguageMode, drop StrictMode.

src/compiler/js-inlining.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/ast.h"
 #include "src/ast-numbering.h"
 #include "src/compiler/access-builder.h"
 #include "src/compiler/ast-graph-builder.h"
 #include "src/compiler/common-operator.h"
 #include "src/compiler/graph-inl.h"
@@ skipping 344 matching lines @@
              info_->shared_info()->DebugName()->ToCString().get());
     }
     return;
   }
 
   CompilationInfoWithZone info(function);
   // TODO(wingo): ParseAndAnalyze can fail due to stack overflow.
   CHECK(Compiler::ParseAndAnalyze(&info));
   CHECK(Compiler::EnsureDeoptimizationSupport(&info));
 
-  if (info.scope()->arguments() != NULL && info.strict_mode() != STRICT) {
+  if (info.scope()->arguments() != NULL && is_sloppy(info.language_mode())) {
     // For now do not inline functions that use their arguments array.
     SmartArrayPointer<char> name = function->shared()->DebugName()->ToCString();
     if (FLAG_trace_turbo_inlining) {
       PrintF(
           "Not Inlining %s into %s because inlinee uses arguments "
           "array\n",
           name.get(), info_->shared_info()->DebugName()->ToCString().get());
     }
     return;
   }
@@ skipping 32 matching lines @@
       }
     }
   }
 
   inlinee.InlineAtCall(jsgraph_, call_node);
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8