Revert of [runtime] Introduce dedicated JSBoundFunction to represent bound functions.

src/arm64/code-stubs-arm64.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #if V8_TARGET_ARCH_ARM64
 
 #include "src/bootstrapper.h"
 #include "src/code-stubs.h"
 #include "src/codegen.h"
 #include "src/ic/handler-compiler.h"
@@ skipping 1532 matching lines @@
   // Fast-case: The {function} must be a valid JSFunction.
   __ Bind(&fast_case);
   __ JumpIfSmi(function, &slow_case);
   __ JumpIfNotObjectType(function, function_map, scratch, JS_FUNCTION_TYPE,
                          &slow_case);
 
   // Ensure that {function} has an instance prototype.
   __ 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));
   __ AssertNotSmi(function_prototype);
 
   // Resolve the prototype if the {function} has an initial map.  Afterwards the
   // {function_prototype} will be either the JSReceiver prototype object or the
   // hole value, which means that no instances of the {function} were created so
   // far and hence we should return false.
   Label function_prototype_valid;
@@ skipping 4276 matching lines @@
                            MemOperand(fp, 6 * kPointerSize), NULL);
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM64