Make sure builtin functions don't rely on __proto__.

src/arm/full-codegen-arm.cc

Index: src/arm/full-codegen-arm.cc
diff --git a/src/arm/full-codegen-arm.cc b/src/arm/full-codegen-arm.cc
index 7037ba959470e4f1b3341a11527873b7dccf585f..1b8ac31876d36ef1b814f7bb0d1c81683e76fcd9 100644
--- a/src/arm/full-codegen-arm.cc
+++ b/src/arm/full-codegen-arm.cc
@@ -1646,8 +1646,6 @@ void FullCodeGenerator::VisitObjectLiteral(ObjectLiteral* expr) {
           }
           break;
         }
-        // Fall through.
-      case ObjectLiteral::Property::PROTOTYPE:
         // Duplicate receiver on stack.
         __ ldr(r0, MemOperand(sp));
         __ push(r0);
@@ -1661,6 +1659,18 @@ void FullCodeGenerator::VisitObjectLiteral(ObjectLiteral* expr) {
           __ Drop(3);
         }
         break;
+      case ObjectLiteral::Property::PROTOTYPE:
+        // Duplicate receiver on stack.
+        __ ldr(r0, MemOperand(sp));
+        __ push(r0);
+        VisitForStackValue(value);
+        if (property->emit_store()) {
+          __ CallRuntime(Runtime::kSetPrototype, 2);
+        } else {
+          __ Drop(2);
+        }
+        break;
+
       case ObjectLiteral::Property::GETTER:
         accessor_table.lookup(key)->second->getter = value;
         break;