[turbofan] Introduce new JSConstructWithArrayLike operator.

src/builtins/arm64/builtins-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/arm64/macro-assembler-arm64-inl.h"
 #include "src/codegen.h"
 #include "src/counters.h"
@@ skipping 2157 matching lines @@
     __ Poke(undefined_value, 0);  // Overwrite receiver.
   }
 
   // ----------- S t a t e -------------
   //  -- x2      : argumentsList
   //  -- x1      : target
   //  -- x3      : new.target
   //  -- jssp[0] : receiver (undefined)
   // -----------------------------------
 
-  // 2. Make sure the target is actually a constructor.
-  Label target_not_constructor;
-  __ JumpIfSmi(target, &target_not_constructor);
-  __ Ldr(x10, FieldMemOperand(target, HeapObject::kMapOffset));
-  __ Ldrb(x10, FieldMemOperand(x10, Map::kBitFieldOffset));
-  __ TestAndBranchIfAllClear(x10, 1 << Map::kIsConstructor,
-                             &target_not_constructor);
+  // 2. We don't need to check explicitly for constructor target here,
+  // since that's the first thing the Construct/ConstructWithArrayLike
+  // builtins will do.
 
-  // 3. Make sure the new.target is actually a constructor.
-  Label new_target_not_constructor;
-  __ JumpIfSmi(new_target, &new_target_not_constructor);
-  __ Ldr(x10, FieldMemOperand(new_target, HeapObject::kMapOffset));
-  __ Ldrb(x10, FieldMemOperand(x10, Map::kBitFieldOffset));
-  __ TestAndBranchIfAllClear(x10, 1 << Map::kIsConstructor,
-                             &new_target_not_constructor);
+  // 3. We don't need to check explicitly for constructor new.target here,
+  // since that's the second thing the Construct/ConstructWithArrayLike
+  // builtins will do.
 
-  // 4a. Construct the target with the given new.target and argumentsList.
+  // 4. Construct the target with the given new.target and argumentsList.
   __ Jump(masm->isolate()->builtins()->ConstructWithArrayLike(),
           RelocInfo::CODE_TARGET);
-
-  // 4b. The target is not a constructor, throw an appropriate TypeError.
-  __ Bind(&target_not_constructor);
-  {
-    __ Poke(target, 0);
-    __ TailCallRuntime(Runtime::kThrowNotConstructor);
-  }
-
-  // 4c. The new.target is not a constructor, throw an appropriate TypeError.
-  __ Bind(&new_target_not_constructor);
-  {
-    __ Poke(new_target, 0);
-    __ TailCallRuntime(Runtime::kThrowNotConstructor);
-  }
 }
 
 static void EnterArgumentsAdaptorFrame(MacroAssembler* masm) {
   __ Push(lr, fp);
   __ Mov(x11, StackFrame::TypeToMarker(StackFrame::ARGUMENTS_ADAPTOR));
   __ Push(x11, x1);  // x1: function
   // We do not yet push the number of arguments, to maintain a 16-byte aligned
   // stack pointer. This is done in step (3) in
   // Generate_ArgumentsAdaptorTrampoline.
   __ Add(fp, jssp, StandardFrameConstants::kFixedFrameSizeFromFp);
@@ skipping 884 matching lines @@
   // Now jump to the instructions of the returned code object.
   __ Jump(x8);
 }
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM