Correctify instanceof and make it optimizable.

src/ia32/macro-assembler-ia32.cc

Index: src/ia32/macro-assembler-ia32.cc
diff --git a/src/ia32/macro-assembler-ia32.cc b/src/ia32/macro-assembler-ia32.cc
index 2ad52208e4ce5116bb911d7eba21a6b86a65fba4..dd624b9c1f0e4cb6e0ac3ecb14bea93cde2eac77 100644
--- a/src/ia32/macro-assembler-ia32.cc
+++ b/src/ia32/macro-assembler-ia32.cc
@@ -1795,33 +1795,8 @@ void MacroAssembler::GetMapConstructor(Register result, Register map,
 }
 
 
-void MacroAssembler::TryGetFunctionPrototype(Register function,
-                                             Register result,
-                                             Register scratch,
-                                             Label* miss,
-                                             bool miss_on_bound_function) {
-  Label non_instance;
-  if (miss_on_bound_function) {
-    // Check that the receiver isn't a smi.
-    JumpIfSmi(function, miss);
-
-    // Check that the function really is a function.
-    CmpObjectType(function, JS_FUNCTION_TYPE, result);
-    j(not_equal, miss);
-
-    // If a bound function, go to miss label.
-    mov(scratch,
-        FieldOperand(function, JSFunction::kSharedFunctionInfoOffset));
-    BooleanBitTest(scratch, SharedFunctionInfo::kCompilerHintsOffset,
-                   SharedFunctionInfo::kBoundFunction);
-    j(not_zero, miss);
-
-    // Make sure that the function has an instance prototype.
-    movzx_b(scratch, FieldOperand(result, Map::kBitFieldOffset));
-    test(scratch, Immediate(1 << Map::kHasNonInstancePrototype));
-    j(not_zero, &non_instance);
-  }
-
+void MacroAssembler::TryGetFunctionPrototype(Register function, Register result,
+                                             Register scratch, Label* miss) {
   // Get the prototype or initial map from the function.
   mov(result,
       FieldOperand(function, JSFunction::kPrototypeOrInitialMapOffset));
@@ -1835,20 +1810,11 @@ void MacroAssembler::TryGetFunctionPrototype(Register function,
   // If the function does not have an initial map, we're done.
   Label done;
   CmpObjectType(result, MAP_TYPE, scratch);
-  j(not_equal, &done);
+  j(not_equal, &done, Label::kNear);
 
   // Get the prototype from the initial map.
   mov(result, FieldOperand(result, Map::kPrototypeOffset));
 
-  if (miss_on_bound_function) {
-    jmp(&done);
-
-    // Non-instance prototype: Fetch prototype from constructor field
-    // in initial map.
-    bind(&non_instance);
-    GetMapConstructor(result, result, scratch);
-  }
-
   // All done.
   bind(&done);
 }