[Interpreter] Remove InterpreterExitTrampoline and replace with returning to the entry trampoline.

src/deoptimizer.h

 // 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.
 
 #ifndef V8_DEOPTIMIZER_H_
 #define V8_DEOPTIMIZER_H_
 
 #include "src/allocation.h"
 #include "src/macro-assembler.h"
 
@@ skipping 384 matching lines @@
   V(kValueMismatch, "value mismatch")                                          \
   V(kWrongInstanceType, "wrong instance type")                                 \
   V(kWrongMap, "wrong map")                                                    \
   V(kUndefinedOrNullInForIn, "null or undefined in for-in")                    \
   V(kUndefinedOrNullInToObject, "null or undefined in ToObject")
 
 class Deoptimizer : public Malloced {
  public:
   enum BailoutType { EAGER, LAZY, SOFT, kLastBailoutType = SOFT };
 
+  enum class BailoutState {
+    NO_REGISTERS,
+    TOS_REGISTER,
+  };
+
+  static const char* BailoutStateToString(BailoutState state) {
+    switch (state) {
+      case BailoutState::NO_REGISTERS:
+        return "NO_REGISTERS";
+      case BailoutState::TOS_REGISTER:
+        return "TOS_REGISTER";
+    }
+    UNREACHABLE();
+    return NULL;

[Michael Starzinger, 2016/05/17 14:41:53]

nit: s/NULL/nullptr/

[rmcilroy, 2016/05/17 15:20:05]

Done.

+  }
+
 #define DEOPT_MESSAGES_CONSTANTS(C, T) C,
   enum DeoptReason {
     DEOPT_MESSAGES_LIST(DEOPT_MESSAGES_CONSTANTS) kLastDeoptReason
   };
 #undef DEOPT_MESSAGES_CONSTANTS
   static const char* GetDeoptReason(DeoptReason deopt_reason);
 
   struct DeoptInfo {
     DeoptInfo(SourcePosition position, DeoptReason deopt_reason, int deopt_id)
         : position(position), deopt_reason(deopt_reason), deopt_id(deopt_id) {}
@@ skipping 703 matching lines @@
   std::vector<Handle<Object> > expression_stack_;
   int source_position_;
 
   friend class Deoptimizer;
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_DEOPTIMIZER_H_