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

src/interpreter/bytecodes.cc

 // Copyright 2015 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/interpreter/bytecodes.h"
 
 #include <iomanip>
 
 #include "src/frames.h"
 #include "src/interpreter/bytecode-traits.h"
@@ skipping 132 matching lines @@
     OperandSize operand_size = GetOperandSize(bytecode, i, operand_scale);
     int delta = static_cast<int>(operand_size);
     DCHECK(base::bits::IsPowerOfTwo32(static_cast<uint32_t>(delta)));
     size += delta;
   }
   return size;
 }
 
 
 // static
+size_t Bytecodes::ReturnCount(Bytecode bytecode) {
+  return bytecode == Bytecode::kReturn ? 1 : 0;
+}
+
+// static
 int Bytecodes::NumberOfOperands(Bytecode bytecode) {
   DCHECK(bytecode <= Bytecode::kLast);
   switch (bytecode) {
 #define CASE(Name, ...)   \
   case Bytecode::k##Name: \
     return BytecodeTraits<__VA_ARGS__>::kOperandCount;
     BYTECODE_LIST(CASE)
 #undef CASE
   }
   UNREACHABLE();
@@ skipping 759 matching lines @@
   } else {
     std::ostringstream s;
     s << "r" << index();
     return s.str();
   }
 }
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8