X87: Correctify instanceof and make it optimizable.

src/x87/macro-assembler-x87.h

Index: src/x87/macro-assembler-x87.h
diff --git a/src/x87/macro-assembler-x87.h b/src/x87/macro-assembler-x87.h
index 24f7f1e8c23fb2063e6b378124d0c8d5619ebfb8..5c428442ea207569c83afd8af793e8b55e6e65da 100644
--- a/src/x87/macro-assembler-x87.h
+++ b/src/x87/macro-assembler-x87.h
@@ -696,11 +696,8 @@ class MacroAssembler: public Assembler {
   // function and jumps to the miss label if the fast checks fail. The
   // function register will be untouched; the other registers may be
   // clobbered.
-  void TryGetFunctionPrototype(Register function,
-                               Register result,
-                               Register scratch,
-                               Label* miss,
-                               bool miss_on_bound_function = false);
+  void TryGetFunctionPrototype(Register function, Register result,
+                               Register scratch, Label* miss);
 
   // Picks out an array index from the hash field.
   // Register use: