[turbofan] Add DebugBreak machine operator and support

src/compiler/machine-operator.cc

 // Copyright 2014 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/machine-operator.h"
 
 #include "src/base/lazy-instance.h"
 #include "src/compiler/opcodes.h"
 #include "src/compiler/operator.h"
 
@@ skipping 508 matching lines @@
   struct AtomicStore##Type##Operator                                           \
       : public Operator1<MachineRepresentation> {                              \
     AtomicStore##Type##Operator()                                              \
         : Operator1<MachineRepresentation>(                                    \
               IrOpcode::kAtomicStore, Operator::kNoRead | Operator::kNoThrow,  \
               "AtomicStore", 3, 1, 1, 0, 1, 0, MachineRepresentation::Type) {} \
   };                                                                           \
   AtomicStore##Type##Operator kAtomicStore##Type;
   ATOMIC_REPRESENTATION_LIST(ATOMIC_STORE)
 #undef STORE
+
+  struct DebugBreakOperator : public Operator {
+    DebugBreakOperator()
+        : Operator(IrOpcode::kDebugBreak, Operator::kNoThrow, "DebugBreak", 0,
+                   0, 0, 0, 0, 0) {}
+  };
+  DebugBreakOperator kDebugBreak;
 };
 
 
 static base::LazyInstance<MachineOperatorGlobalCache>::type kCache =
     LAZY_INSTANCE_INITIALIZER;
 
 
 MachineOperatorBuilder::MachineOperatorBuilder(Zone* zone,
                                                MachineRepresentation word,
                                                Flags flags)
@@ skipping 58 matching lines @@
     MACHINE_REPRESENTATION_LIST(STORE)
 #undef STORE
     case MachineRepresentation::kBit:
     case MachineRepresentation::kNone:
       break;
   }
   UNREACHABLE();
   return nullptr;
 }
 
+const Operator* MachineOperatorBuilder::DebugBreak() {
+  return &cache_.kDebugBreak;
+}
 
 const Operator* MachineOperatorBuilder::CheckedLoad(
     CheckedLoadRepresentation rep) {
 #define LOAD(Type)                     \
   if (rep == MachineType::Type()) {    \
     return &cache_.kCheckedLoad##Type; \
   }
     MACHINE_TYPE_LIST(LOAD)
 #undef LOAD
   UNREACHABLE();
@@ skipping 49 matching lines @@
   }
   ATOMIC_REPRESENTATION_LIST(STORE)
 #undef STORE
   UNREACHABLE();
   return nullptr;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8