[runtime] Introduce dedicated JSBoundFunction to represent bound functions.

src/full-codegen/ia32/full-codegen-ia32.cc

Index: src/full-codegen/ia32/full-codegen-ia32.cc
diff --git a/src/full-codegen/ia32/full-codegen-ia32.cc b/src/full-codegen/ia32/full-codegen-ia32.cc
index 06e43301000c6f77341a4c4a1e265ed097f29e78..f5787efc50bc557dfcb44872aa228fae6e09295a 100644
--- a/src/full-codegen/ia32/full-codegen-ia32.cc
+++ b/src/full-codegen/ia32/full-codegen-ia32.cc
@@ -3011,9 +3011,9 @@ 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);
 }