Introduce bytecodes for assisting generator suspend and resume.

src/interpreter/bytecodes.h

Index: src/interpreter/bytecodes.h
diff --git a/src/interpreter/bytecodes.h b/src/interpreter/bytecodes.h
index 44f93cd76ab764da98b81e70b68063a121bbada5..4c602f5a6416134d4b026e5995692710275bd2ae 100644
--- a/src/interpreter/bytecodes.h
+++ b/src/interpreter/bytecodes.h
@@ -241,6 +241,10 @@ namespace interpreter {
   V(ReThrow, AccumulatorUse::kRead)                                           \
   V(Return, AccumulatorUse::kNone)                                            \
                                                                               \
+  /* Generators */                                                            \
+  V(SuspendGenerator, AccumulatorUse::kRead, OperandType::kReg)               \
+  V(ResumeGenerator, AccumulatorUse::kWrite, OperandType::kReg)               \
+                                                                              \
   /* Debugger */                                                              \
   V(Debugger, AccumulatorUse::kNone)                                          \
   DEBUG_BREAK_BYTECODE_LIST(V)                                                \
@@ -396,11 +400,12 @@ class Register {
     return index() >= other.index();
   }
 
- private:
-  static const int kInvalidIndex = kMaxInt;
   static const int kRegisterFileStartOffset =
       InterpreterFrameConstants::kRegisterFileFromFp / kPointerSize;
 
+ private:
+  static const int kInvalidIndex = kMaxInt;
+
   void* operator new(size_t size);
   void operator delete(void* p);