WIP [esnext] implement async iteration proposal

src/interpreter/bytecode-array-builder.cc

Index: src/interpreter/bytecode-array-builder.cc
diff --git a/src/interpreter/bytecode-array-builder.cc b/src/interpreter/bytecode-array-builder.cc
index 652c32d35dbcc48b3696d5e828daa941b0537b3f..4c17ae1a5c5a1edd66aa66b727ef6ab065c90760 100644
--- a/src/interpreter/bytecode-array-builder.cc
+++ b/src/interpreter/bytecode-array-builder.cc
@@ -839,8 +839,13 @@ BytecodeArrayBuilder& BytecodeArrayBuilder::LoadModuleVariable(int cell_index,
 }
 
 BytecodeArrayBuilder& BytecodeArrayBuilder::SuspendGenerator(
-    Register generator) {
-  OutputSuspendGenerator(generator);
+    Register generator, Yield::YieldType type) {
+  if (type == Yield::kNormal || type == Yield::kDelegate) {
+    OutputSuspendGenerator(generator);
+  } else {
+    DCHECK_EQ(type, Yield::kAwait);
+    OutputAwaitGenerator(generator);
+  }
   return *this;
 }