Inline String.fromCharCode in hydrogen.

src/hydrogen.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 8529 matching lines @@
           ast_context()->ReturnInstruction(char_code, expr->id());
           return true;
         }
         AddInstruction(char_code);
         HInstruction* result =
             HStringCharFromCode::New(zone(), context, char_code);
         ast_context()->ReturnInstruction(result, expr->id());
         return true;
       }
       break;
+    case kStringFromCharCode:
+      if (argument_count == 2 && check_type == RECEIVER_MAP_CHECK) {
+        AddCheckConstantFunction(expr->holder(), receiver, receiver_map);
+        HValue* argument = Pop();
+        HValue* context = environment()->LookupContext();
+        Drop(1);  // Receiver.
+        HInstruction* result =
+            HStringCharFromCode::New(zone(), context, argument);
+        ast_context()->ReturnInstruction(result, expr->id());
+        return true;
+      }
+      break;
     case kMathExp:
       if (!FLAG_fast_math) break;
       // Fall through if FLAG_fast_math.
     case kMathRound:
     case kMathFloor:
     case kMathAbs:
     case kMathSqrt:
     case kMathLog:
     case kMathSin:
     case kMathCos:
@@ skipping 3115 matching lines @@
     }
   }
 
 #ifdef DEBUG
   if (graph_ != NULL) graph_->Verify(false);  // No full verify.
   if (allocator_ != NULL) allocator_->Verify();
 #endif
 }
 
 } }  // namespace v8::internal