[builtins] Start refactoring the Apply builtin.

src/arm64/macro-assembler-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/arm64/frames-arm64.h"
 #include "src/assembler.h"
 #include "src/base/bits.h"
 #include "src/base/division-by-constant.h"
@@ skipping 1763 matching lines @@
 
 
 void MacroAssembler::AssertNotSmi(Register object, BailoutReason reason) {
   if (emit_debug_code()) {
     STATIC_ASSERT(kSmiTag == 0);
     Tst(object, kSmiTagMask);
     Check(ne, reason);
   }
 }
 
+void MacroAssembler::AssertFixedArray(Register object) {
+  if (emit_debug_code()) {
+    AssertNotSmi(object, kOperandIsASmiAndNotAFixedArray);
+
+    UseScratchRegisterScope temps(this);
+    Register temp = temps.AcquireX();
+
+    CompareObjectType(object, temp, temp, FIXED_ARRAY_TYPE);
+    Check(eq, kOperandIsNotAFixedArray);
+  }
+}
 
 void MacroAssembler::AssertFunction(Register object) {
   if (emit_debug_code()) {
     AssertNotSmi(object, kOperandIsASmiAndNotAFunction);
 
     UseScratchRegisterScope temps(this);
     Register temp = temps.AcquireX();
 
     CompareObjectType(object, temp, temp, JS_FUNCTION_TYPE);
     Check(eq, kOperandIsNotAFunction);
@@ skipping 2975 matching lines @@
 }
 
 
 #undef __
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM64