[strong] Disallow implicit conversions for add

src/ic/ic.cc

 // 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.
 
 #include "src/v8.h"
 
 #include "src/accessors.h"
 #include "src/api.h"
 #include "src/arguments.h"
 #include "src/base/bits.h"
@@ skipping 2803 matching lines @@
   CHECK(false);
   return isolate->heap()->undefined_value();
 }
 
 
 Builtins::JavaScript BinaryOpIC::TokenToJSBuiltin(Token::Value op,
                                                   LanguageMode language_mode) {
   if (is_strong(language_mode)) {
     switch (op) {
       default: UNREACHABLE();
-      case Token::ADD: return Builtins::ADD;
+      case Token::ADD: return Builtins::ADD_STRONG;
       case Token::SUB: return Builtins::SUB_STRONG;
       case Token::MUL: return Builtins::MUL_STRONG;
       case Token::DIV: return Builtins::DIV_STRONG;
       case Token::MOD: return Builtins::MOD_STRONG;
       case Token::BIT_OR: return Builtins::BIT_OR_STRONG;
       case Token::BIT_AND: return Builtins::BIT_AND_STRONG;
       case Token::BIT_XOR: return Builtins::BIT_XOR_STRONG;
       case Token::SAR: return Builtins::SAR_STRONG;
       case Token::SHR: return Builtins::SHR_STRONG;
       case Token::SHL: return Builtins::SHL_STRONG;
@@ skipping 216 matching lines @@
 static const Address IC_utilities[] = {
 #define ADDR(name) FUNCTION_ADDR(name),
     IC_UTIL_LIST(ADDR) NULL
 #undef ADDR
 };
 
 
 Address IC::AddressFromUtilityId(IC::UtilityId id) { return IC_utilities[id]; }
 }
 }  // namespace v8::internal