[turbofan] Introduce a dedicated CheckMaps simplified operator.

src/compiler/simplified-operator.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.
 
 #include "src/compiler/simplified-operator.h"
 
 #include "src/base/lazy-instance.h"
 #include "src/compiler/opcodes.h"
 #include "src/compiler/operator.h"
 #include "src/types.h"
@@ skipping 489 matching lines @@
   switch (mode) {
     case CheckForMinusZeroMode::kCheckForMinusZero:
       return &cache_.kCheckedInt32MulCheckForMinusZeroOperator;
     case CheckForMinusZeroMode::kDontCheckForMinusZero:
       return &cache_.kCheckedInt32MulDontCheckForMinusZeroOperator;
   }
   UNREACHABLE();
   return nullptr;
 }
 
+const Operator* SimplifiedOperatorBuilder::CheckMaps(int map_input_count) {
+  // TODO(bmeurer): Cache the most important versions of this operator.
+  DCHECK_LT(0, map_input_count);
+  int const value_input_count = 1 + map_input_count;
+  return new (zone()) Operator1<int>(           // --
+      IrOpcode::kCheckMaps,                     // opcode
+      Operator::kNoThrow | Operator::kNoWrite,  // flags
+      "CheckMaps",                              // name
+      value_input_count, 1, 1, 0, 1, 0,         // counts
+      map_input_count);                         // parameter
+}
+
 const Operator* SimplifiedOperatorBuilder::CheckFloat64Hole(
     CheckFloat64HoleMode mode) {
   switch (mode) {
     case CheckFloat64HoleMode::kAllowReturnHole:
       return &cache_.kCheckFloat64HoleAllowReturnHoleOperator;
     case CheckFloat64HoleMode::kNeverReturnHole:
       return &cache_.kCheckFloat64HoleNeverReturnHoleOperator;
   }
   UNREACHABLE();
   return nullptr;
@@ skipping 112 matching lines @@
                         Operator::kNoDeopt | Operator::kNoThrow | properties,  \
                         #Name, value_input_count, 1, control_input_count,      \
                         output_count, 1, 0, access);                           \
   }
 ACCESS_OP_LIST(ACCESS)
 #undef ACCESS
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8