WIP [esnext] implement async iteration proposal

src/bailout-reason.h

Index: src/bailout-reason.h
diff --git a/src/bailout-reason.h b/src/bailout-reason.h
index d9e9215682115b9c079a3f6ca48394ddc98f6529..7aef021f99d555f77c3ab93b972015ff09dd65d2 100644
--- a/src/bailout-reason.h
+++ b/src/bailout-reason.h
@@ -146,6 +146,8 @@ namespace internal {
   V(kOperandIsASmiAndNotAFunction, "Operand is a smi and not a function")      \
   V(kOperandIsASmiAndNotAGeneratorObject,                                      \
     "Operand is a smi and not a generator object")                             \
+  V(kOperandIsASmiAndNotAnAsyncGeneratorObject,                                \
+    "Operand is a smi and not an async generator object")                      \
   V(kOperandIsASmiAndNotAName, "Operand is a smi and not a name")              \
   V(kOperandIsASmiAndNotAReceiver, "Operand is a smi and not a receiver")      \
   V(kOperandIsASmiAndNotAString, "Operand is a smi and not a string")          \
@@ -153,6 +155,8 @@ namespace internal {
   V(kOperandIsNotABoundFunction, "Operand is not a bound function")            \
   V(kOperandIsNotAFunction, "Operand is not a function")                       \
   V(kOperandIsNotAGeneratorObject, "Operand is not a generator object")        \
+  V(kOperandIsNotAnAsyncGeneratorObject,                                       \
+    "Operand is not an async generator object")                                \
   V(kOperandIsNotAName, "Operand is not a name")                               \
   V(kOperandIsNotANumber, "Operand is not a number")                           \
   V(kOperandIsNotAReceiver, "Operand is not a receiver")                       \