PPC: Fix AssertFunction.

src/ppc/macro-assembler-ppc.cc

Index: src/ppc/macro-assembler-ppc.cc
diff --git a/src/ppc/macro-assembler-ppc.cc b/src/ppc/macro-assembler-ppc.cc
index fde79df04c76aec63d22db311b238f09c8123735..38e0009090ff2da3ae63fdb01987ea6c971c335b 100644
--- a/src/ppc/macro-assembler-ppc.cc
+++ b/src/ppc/macro-assembler-ppc.cc
@@ -2586,7 +2586,9 @@ void MacroAssembler::AssertFunction(Register object) {
     STATIC_ASSERT(kSmiTag == 0);
     TestIfSmi(object, r0);
     Check(ne, kOperandIsASmiAndNotAFunction, cr0);
-    CompareObjectType(object, r0, r0, JS_FUNCTION_TYPE);
+    push(object);
+    CompareObjectType(object, object, object, JS_FUNCTION_TYPE);
+    pop(object);
     Check(eq, kOperandIsNotAFunction);
   }
 }