[turbofan] Emit explicit checkpoint before operations.

src/compiler/common-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/common-operator.h"
 
 #include "src/assembler.h"
 #include "src/base/lazy-instance.h"
 #include "src/compiler/linkage.h"
 #include "src/compiler/opcodes.h"
@@ skipping 161 matching lines @@
   V(DeoptimizeIf, Operator::kFoldable, 2, 1, 1, 0, 1, 1)     \
   V(DeoptimizeUnless, Operator::kFoldable, 2, 1, 1, 0, 1, 1) \
   V(IfTrue, Operator::kKontrol, 0, 0, 1, 0, 0, 1)            \
   V(IfFalse, Operator::kKontrol, 0, 0, 1, 0, 0, 1)           \
   V(IfSuccess, Operator::kKontrol, 0, 0, 1, 0, 0, 1)         \
   V(IfDefault, Operator::kKontrol, 0, 0, 1, 0, 0, 1)         \
   V(Throw, Operator::kKontrol, 1, 1, 1, 0, 0, 1)             \
   V(Terminate, Operator::kKontrol, 0, 1, 1, 0, 0, 1)         \
   V(OsrNormalEntry, Operator::kFoldable, 0, 1, 1, 0, 1, 1)   \
   V(OsrLoopEntry, Operator::kFoldable, 0, 1, 1, 0, 1, 1)     \
-  V(Checkpoint, Operator::kKontrol, 1, 1, 1, 0, 1, 0)        \
+  V(Checkpoint, Operator::kKontrol, 0, 1, 1, 0, 1, 0)        \
   V(BeginRegion, Operator::kNoThrow, 0, 1, 0, 0, 1, 0)       \
   V(FinishRegion, Operator::kNoThrow, 1, 1, 0, 1, 1, 0)
 
 #define CACHED_RETURN_LIST(V) \
   V(1)                        \
   V(2)                        \
   V(3)
 
 
 #define CACHED_END_LIST(V) \
@@ skipping 694 matching lines @@
 CommonOperatorBuilder::CreateFrameStateFunctionInfo(
     FrameStateType type, int parameter_count, int local_count,
     Handle<SharedFunctionInfo> shared_info) {
   return new (zone()->New(sizeof(FrameStateFunctionInfo)))
       FrameStateFunctionInfo(type, parameter_count, local_count, shared_info);
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8