3.8 for block without a POP_BLOCK ...

and confusing JUMP_BACK for CONTINUE. Expect more like this.

Fixes #293

Author: rocky

test/bytecode_3.8/01_for_continue.pyc

@@ -0,0 +1,5 @@
+# Bug is turning a JUMP_BACK for a CONTINUE so for has no JUMP_BACK.
+# Also there is no POP_BLOCK since there isn't anything in the loop.
+# In the future when we have better control flow, we might redo all of this.
+for i in range(2):
+    pass

test/simple_source/bug38/01_for_continue.py

@@ -92,6 +92,7 @@ def p_38misc(self, args):
         for38              ::= expr get_iter store for_block JUMP_BACK
         for38              ::= expr for_iter store for_block JUMP_BACK
         for38              ::= expr for_iter store for_block JUMP_BACK POP_BLOCK
+        for38              ::= expr for_iter store for_block
 
         forelsestmt38      ::= expr for_iter store for_block POP_BLOCK else_suite
         forelselaststmt38  ::= expr for_iter store for_block POP_BLOCK else_suitec