Implement unary addition in the full (non-optimizing) code generator.

src/arm/full-codegen-arm.cc

 // Copyright 2009 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 1333 matching lines @@
       } else {
         // This expression cannot throw a reference error at the top level.
         VisitForValue(expr->expression(), kStack);
       }
 
       __ CallRuntime(Runtime::kTypeof, 1);
       Apply(context_, r0);
       break;
     }
 
+    case Token::ADD: {
+      Comment cmt(masm_, "[ UnaryOperation (ADD)");
+      VisitForValue(expr->expression(), kAccumulator);
+      Label no_conversion;
+      __ tst(result_register(), Operand(kSmiTagMask));
+      __ b(eq, &no_conversion);
+      __ push(r0);
+      __ InvokeBuiltin(Builtins::TO_NUMBER, CALL_JS);
+      __ bind(&no_conversion);
+      Apply(context_, result_register());
+      break;
+    }
+
     default:
       UNREACHABLE();
   }
 }
 
 
 void FullCodeGenerator::VisitCountOperation(CountOperation* expr) {
   Comment cmnt(masm_, "[ CountOperation");
 
   // Expression can only be a property, a global or a (parameter or local)
@@ skipping 336 matching lines @@
   __ pop(result_register());
   ASSERT_EQ(1, kSmiTagSize + kSmiShiftSize);
   __ mov(r1, Operand(r1, ASR, 1));  // Un-smi-tag value.
   __ add(pc, r1, Operand(masm_->CodeObject()));
 }
 
 
 #undef __
 
 } }  // namespace v8::internal