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

src/x87/code-stubs-x87.cc

Index: src/x87/code-stubs-x87.cc
diff --git a/src/x87/code-stubs-x87.cc b/src/x87/code-stubs-x87.cc
index fc10a9b995866a11dac8cc30eab48fee1357fee6..cc5387a4ff4915ababf0bf3d088f61e8e9796b46 100644
--- a/src/x87/code-stubs-x87.cc
+++ b/src/x87/code-stubs-x87.cc
@@ -2269,14 +2269,6 @@ 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));