[turbofan] Introduce new JSConstructWithArrayLike operator.

src/builtins/ia32/builtins-ia32.cc

 // Copyright 2012 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_IA32
 
 #include "src/code-factory.h"
 #include "src/codegen.h"
 #include "src/deoptimizer.h"
 #include "src/full-codegen/full-codegen.h"
@@ skipping 1840 matching lines @@
   }
 
   // ----------- S t a t e -------------
   //  -- ebx    : argumentsList
   //  -- edx    : new.target
   //  -- edi    : target
   //  -- esp[0] : return address
   //  -- esp[4] : receiver (undefined)
   // -----------------------------------
 
-  // 2. Make sure the target is actually a constructor.
-  Label target_not_constructor;
-  __ JumpIfSmi(edi, &target_not_constructor, Label::kNear);
-  __ mov(ecx, FieldOperand(edi, HeapObject::kMapOffset));
-  __ test_b(FieldOperand(ecx, Map::kBitFieldOffset),
-            Immediate(1 << Map::kIsConstructor));
-  __ j(zero, &target_not_constructor, Label::kNear);
+  // 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 target is actually a constructor.
-  Label new_target_not_constructor;
-  __ JumpIfSmi(edx, &new_target_not_constructor, Label::kNear);
-  __ mov(ecx, FieldOperand(edx, HeapObject::kMapOffset));
-  __ test_b(FieldOperand(ecx, Map::kBitFieldOffset),
-            Immediate(1 << Map::kIsConstructor));
-  __ j(zero, &new_target_not_constructor, Label::kNear);
+  // 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);
-  {
-    __ mov(Operand(esp, kPointerSize), edi);
-    __ TailCallRuntime(Runtime::kThrowNotConstructor);
-  }
-
-  // 4c. The new.target is not a constructor, throw an appropriate TypeError.
-  __ bind(&new_target_not_constructor);
-  {
-    __ mov(Operand(esp, kPointerSize), edx);
-    __ TailCallRuntime(Runtime::kThrowNotConstructor);
-  }
 }
 
 void Builtins::Generate_InternalArrayCode(MacroAssembler* masm) {
   // ----------- S t a t e -------------
   //  -- eax : argc
   //  -- esp[0] : return address
   //  -- esp[4] : last argument
   // -----------------------------------
   Label generic_array_code;
 
@@ skipping 1270 matching lines @@
   }
   // Now jump to the instructions of the returned code object.
   __ jmp(edi);
 }
 
 #undef __
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_IA32