Fix More 3.6 async parsing

... all from 3.6 test_coroutines.py.

More bugs remain

test/simple_source/bug36/03_async_from_coroutine.py

@@ -0,0 +1,39 @@
+# These are from 3.6 test_coroutines.py
+async def iterate(gen):
+    res = []
+    async for i in gen:
+        res.append(i)
+    return res
+
+def test_comp_5(f):
+    # async def f(it):
+    #     for i in it:
+    #         yield i
+
+    async def run_list():
+        return [i
+                for
+                pair in
+                ([10, 20])
+                async for i
+                in f
+                ]
+
+async def test2(x, buffer, f):
+    with x:
+        async for i in f:
+            if i:
+                break
+        else:
+            buffer()
+    buffer()
+
+async def test3(x, buffer, f):
+    with x:
+        async for i in f:
+            if i:
+                continue
+            buffer()
+        else:
+            buffer.append()
+    buffer()