X87: [runtime] Introduce dedicated JSBoundFunction to represent bound functions.

src/full-codegen/x87/full-codegen-x87.cc

Index: src/full-codegen/x87/full-codegen-x87.cc
diff --git a/src/full-codegen/x87/full-codegen-x87.cc b/src/full-codegen/x87/full-codegen-x87.cc
index 90ca2005a2394dfd8879bdd3066637d993baca29..35037d71fabd3f053f401d413726ca5ed51aae38 100644
--- a/src/full-codegen/x87/full-codegen-x87.cc
+++ b/src/full-codegen/x87/full-codegen-x87.cc
@@ -3024,9 +3024,9 @@ void FullCodeGenerator::EmitIsFunction(CallRuntime* expr) {
                          &if_true, &if_false, &fall_through);
 
   __ JumpIfSmi(eax, if_false);
-  __ CmpObjectType(eax, JS_FUNCTION_TYPE, ebx);
+  __ CmpObjectType(eax, FIRST_FUNCTION_TYPE, ebx);
   PrepareForBailoutBeforeSplit(expr, true, if_true, if_false);
-  Split(equal, if_true, if_false, fall_through);
+  Split(above_equal, if_true, if_false, fall_through);
 
   context()->Plug(if_true, if_false);
 }