[runtime] Introduce dedicated JSBoundFunction to represent bound functions.

src/ia32/code-stubs-ia32.cc

Index: src/ia32/code-stubs-ia32.cc
diff --git a/src/ia32/code-stubs-ia32.cc b/src/ia32/code-stubs-ia32.cc
index 527800b80ede2bafb2efdc232c5b302cdc74df3d..6f1025b24d983aedf9cf71e7891ea8457e7f754c 100644
--- a/src/ia32/code-stubs-ia32.cc
+++ b/src/ia32/code-stubs-ia32.cc
@@ -2531,14 +2531,6 @@ void InstanceOfStub::Generate(MacroAssembler* masm) {
             static_cast<uint8_t>(1 << Map::kHasNonInstancePrototype));
   __ j(not_zero, &slow_case);
 
-  // Ensure that {function} is not bound.
-  Register const shared_info = scratch;
-  __ mov(shared_info,
-         FieldOperand(function, JSFunction::kSharedFunctionInfoOffset));
-  __ BooleanBitTest(shared_info, SharedFunctionInfo::kCompilerHintsOffset,
-                    SharedFunctionInfo::kBoundFunction);
-  __ j(not_zero, &slow_case);
-
   // Get the "prototype" (or initial map) of the {function}.
   __ mov(function_prototype,
          FieldOperand(function, JSFunction::kPrototypeOrInitialMapOffset));