[turbofan] Sanitize language mode for javascript operators.

src/globals.h

 // Copyright 2012 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.
 
 #ifndef V8_GLOBALS_H_
 #define V8_GLOBALS_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
+#include <ostream>
+
 #include "src/base/build_config.h"
 #include "src/base/logging.h"
 #include "src/base/macros.h"
 
 // Unfortunately, the INFINITY macro cannot be used with the '-pedantic'
 // warning flag and certain versions of GCC due to a bug:
 // http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11931
 // For now, we use the more involved template-based version from <limits>, but
 // only when compiling with GCC versions affected by the bug (2.96.x - 4.0.x)
 #if V8_CC_GNU && V8_GNUC_PREREQ(2, 96, 0) && !V8_GNUC_PREREQ(4, 1, 0)
@@ skipping 210 matching lines @@
   STRONG_BIT = 1 << 1,
   LANGUAGE_END,
 
   // Shorthands for some common language modes.
   SLOPPY = 0,
   STRICT = STRICT_BIT,
   STRONG = STRICT_BIT | STRONG_BIT
 };
 
 
+inline std::ostream& operator<<(std::ostream& os, LanguageMode mode) {
+  switch (mode) {
+    case SLOPPY:
+      return os << "sloppy";
+    case STRICT:
+      return os << "strict";
+    case STRONG:
+      return os << "strong";
+    default:
+      return os << "unknown";
+  }
+}
+
+
 inline bool is_sloppy(LanguageMode language_mode) {
   return (language_mode & STRICT_BIT) == 0;
 }
 
 
 inline bool is_strict(LanguageMode language_mode) {
   return language_mode & STRICT_BIT;
 }
 
 
@@ skipping 676 matching lines @@
 inline FunctionKind WithObjectLiteralBit(FunctionKind kind) {
   kind = static_cast<FunctionKind>(kind | FunctionKind::kInObjectLiteral);
   DCHECK(IsValidFunctionKind(kind));
   return kind;
 }
 } }  // namespace v8::internal
 
 namespace i = v8::internal;
 
 #endif  // V8_GLOBALS_H_