PPC: Fix "Unify the stack layout for construct frames"

src/ppc/builtins-ppc.cc

Index: src/ppc/builtins-ppc.cc
diff --git a/src/ppc/builtins-ppc.cc b/src/ppc/builtins-ppc.cc
index b9c25433731ac74d29a3ef681d066db954b6c5a5..077d8dc6faf051f2d24b8ee7165cdd66cc4bea1c 100644
--- a/src/ppc/builtins-ppc.cc
+++ b/src/ppc/builtins-ppc.cc
@@ -626,11 +626,11 @@ static void Generate_JSConstructStubHelper(MacroAssembler* masm,
       __ bind(&count_incremented);
     }
 
-    __ Pop(r4);
+    __ pop(r4);  // Constructor function.
 
     __ Push(r7, r7);
 
-    // Reload the number of arguments and the constructor from the stack.
+    // Reload the number of arguments from the stack.
     // sp[0]: receiver
     // sp[1]: receiver
     // sp[2]: number of arguments (smi-tagged)