[es6] Introduce %ToInteger and %ToLength.

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>
 
@@ skipping 756 matching lines @@
 const uint32_t kHoleNanLower32 = 0xFFFF7FFF;
 #else
 const uint32_t kHoleNanUpper32 = 0xFFF7FFFF;
 const uint32_t kHoleNanLower32 = 0xFFF7FFFF;
 #endif
 
 const uint64_t kHoleNanInt64 =
     (static_cast<uint64_t>(kHoleNanUpper32) << 32) | kHoleNanLower32;
 
 
+// ES6 section 20.1.2.6 Number.MAX_SAFE_INTEGER
+const double kMaxSafeInteger = 9007199254740991.0;  // 2^53-1
+
+
 // The order of this enum has to be kept in sync with the predicates below.
 enum VariableMode {
   // User declared variables:
   VAR,             // declared via 'var', and 'function' declarations
 
   CONST_LEGACY,    // declared via legacy 'const' declarations
 
   LET,             // declared via 'let' declarations (first lexical)
 
   CONST,           // declared via 'const' declarations
@@ skipping 227 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_