PPC: [runtime] Initial step towards switching Execution::Call to callable.

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 14725997838609a126e18812abfb24f22e624caa..e54f409b8436e76d0d383f3eaf62595d6cf1a2ff 100644
--- a/src/ppc/builtins-ppc.cc
+++ b/src/ppc/builtins-ppc.cc
@@ -791,8 +791,7 @@ static void Generate_JSEntryTrampolineHelper(MacroAssembler* masm,
       CallConstructStub stub(masm->isolate(), NO_CALL_CONSTRUCTOR_FLAGS);
       __ CallStub(&stub);
     } else {
-      ParameterCount actual(r3);
-      __ InvokeFunction(r4, actual, CALL_FUNCTION, NullCallWrapper());
+      __ Call(masm->isolate()->builtins()->Call(), RelocInfo::CODE_TARGET);
     }
     // Exit the JS frame and remove the parameters (except function), and
     // return.