X87: Reshuffle registers in JSConstructStub to avoid trashing costructor and new.target on fast pat…

src/x87/builtins-x87.cc

Index: src/x87/builtins-x87.cc
diff --git a/src/x87/builtins-x87.cc b/src/x87/builtins-x87.cc
index 8c2433b16afdc2f2cb875d6799c019f3a331d34c..a3ef9f1e8fdf920369ba984aef5024542d724a50 100644
--- a/src/x87/builtins-x87.cc
+++ b/src/x87/builtins-x87.cc
@@ -258,8 +258,10 @@ static void Generate_JSConstructStubHelper(MacroAssembler* masm,
                       kUnexpectedNumberOfPreAllocatedPropertyFields);
           }
           __ InitializeFieldsWithFiller(ecx, esi, edx);
+
+          // To allow truncation fill the remaining fields with one pointer
+          // filler map.
           __ mov(edx, factory->one_pointer_filler_map());
-          // Fill the remaining fields with one pointer filler map.
 
           __ bind(&no_inobject_slack_tracking);
         }