[turbofan] Introduce explicit loop exits markers.

src/compiler/opcodes.h

 // Copyright 2013 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.
 
 #ifndef V8_COMPILER_OPCODES_H_
 #define V8_COMPILER_OPCODES_H_
 
 #include <iosfwd>
 
 // Opcodes for control operators.
@@ skipping 39 matching lines @@
   V(Checkpoint)          \
   V(BeginRegion)         \
   V(FinishRegion)        \
   V(FrameState)          \
   V(StateValues)         \
   V(TypedStateValues)    \
   V(ObjectState)         \
   V(Call)                \
   V(Parameter)           \
   V(OsrValue)            \
+  V(LoopExit)            \

[Michael Starzinger, 2016/07/14 13:09:40]

suggestion: Technically this is a control node, we could move it to
CONTROL_OP_LIST. But I don't mind either way.

+  V(LoopExitValue)       \
+  V(LoopExitEffect)      \
   V(Projection)
 
 #define COMMON_OP_LIST(V) \
   CONSTANT_OP_LIST(V)     \
   INNER_OP_LIST(V)        \
   V(Dead)
 
 // Opcodes for JavaScript operators.
 #define JS_COMPARE_BINOP_LIST(V) \
   V(JSEqual)                     \
@@ skipping 645 matching lines @@
   }
 };
 
 std::ostream& operator<<(std::ostream&, IrOpcode::Value);
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_OPCODES_H_