[turbofan] Introduce new JSConstructWithArrayLike operator.

src/builtins/mips64/builtins-mips64.cc

Index: src/builtins/mips64/builtins-mips64.cc
diff --git a/src/builtins/mips64/builtins-mips64.cc b/src/builtins/mips64/builtins-mips64.cc
index c4c19890f6ac7a1512635e975dc48e67eeb7fb9c..cec78ce13acd91ee3c144b3a5e650336fad0072d 100644
--- a/src/builtins/mips64/builtins-mips64.cc
+++ b/src/builtins/mips64/builtins-mips64.cc
@@ -2101,39 +2101,17 @@ void Builtins::Generate_ReflectConstruct(MacroAssembler* masm) {
   //  -- sp[0] : receiver (undefined)
   // -----------------------------------
 
-  // 2. Make sure the target is actually a constructor.
-  Label target_not_constructor;
-  __ JumpIfSmi(target, &target_not_constructor);
-  __ Ld(a4, FieldMemOperand(target, HeapObject::kMapOffset));
-  __ Lbu(a4, FieldMemOperand(a4, Map::kBitFieldOffset));
-  __ And(a4, a4, Operand(1 << Map::kIsConstructor));
-  __ Branch(&target_not_constructor, eq, a4, Operand(zero_reg));
-
-  // 3. Make sure the target is actually a constructor.
-  Label new_target_not_constructor;
-  __ JumpIfSmi(new_target, &new_target_not_constructor);
-  __ Ld(a4, FieldMemOperand(new_target, HeapObject::kMapOffset));
-  __ Lbu(a4, FieldMemOperand(a4, Map::kBitFieldOffset));
-  __ And(a4, a4, Operand(1 << Map::kIsConstructor));
-  __ Branch(&new_target_not_constructor, eq, a4, Operand(zero_reg));
-
-  // 4a. Construct the target with the given new.target and argumentsList.
-  __ Jump(masm->isolate()->builtins()->ConstructWithArrayLike(),
-          RelocInfo::CODE_TARGET);
+  // 2. We don't need to check explicitly for constructor target here,
+  // since that's the first thing the Construct/ConstructWithArrayLike
+  // builtins will do.
 
-  // 4b. The target is not a constructor, throw an appropriate TypeError.
-  __ bind(&target_not_constructor);
-  {
-    __ Sd(target, MemOperand(sp));
-    __ TailCallRuntime(Runtime::kThrowNotConstructor);
-  }
+  // 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.
 
-  // 4c. The new.target is not a constructor, throw an appropriate TypeError.
-  __ bind(&new_target_not_constructor);
-  {
-    __ Sd(new_target, MemOperand(sp));
-    __ TailCallRuntime(Runtime::kThrowNotConstructor);
-  }
+  // 4. Construct the target with the given new.target and argumentsList.
+  __ Jump(masm->isolate()->builtins()->ConstructWithArrayLike(),
+          RelocInfo::CODE_TARGET);
 }
 
 static void EnterArgumentsAdaptorFrame(MacroAssembler* masm) {