[runtime] Introduce dedicated JSBoundFunction to represent bound functions.

src/arm64/code-stubs-arm64.cc

Index: src/arm64/code-stubs-arm64.cc
diff --git a/src/arm64/code-stubs-arm64.cc b/src/arm64/code-stubs-arm64.cc
index 2dbe4302e8bd1608e2b2cf89738502d299f4294d..b31726458b181886c8b1f46460bd37039dfe045b 100644
--- a/src/arm64/code-stubs-arm64.cc
+++ b/src/arm64/code-stubs-arm64.cc
@@ -1550,17 +1550,6 @@ void InstanceOfStub::Generate(MacroAssembler* masm) {
   __ Ldrb(scratch, FieldMemOperand(function_map, Map::kBitFieldOffset));
   __ Tbnz(scratch, Map::kHasNonInstancePrototype, &slow_case);
 
-  // Ensure that {function} is not bound.
-  Register const shared_info = scratch;
-  Register const scratch_w = scratch.W();
-  __ Ldr(shared_info,
-         FieldMemOperand(function, JSFunction::kSharedFunctionInfoOffset));
-  // On 64-bit platforms, compiler hints field is not a smi. See definition of
-  // kCompilerHintsOffset in src/objects.h.
-  __ Ldr(scratch_w, FieldMemOperand(shared_info,
-                                    SharedFunctionInfo::kCompilerHintsOffset));
-  __ Tbnz(scratch_w, SharedFunctionInfo::kBoundFunction, &slow_case);
-
   // Get the "prototype" (or initial map) of the {function}.
   __ Ldr(function_prototype,
          FieldMemOperand(function, JSFunction::kPrototypeOrInitialMapOffset));