More PyPy grammar rules

* assert one and two-arg form
* trystmt

Simplify adding multiple grammar rules

test/simple_source/bug_pypy27/01_assert2.py

@@ -0,0 +1,17 @@
+# From PyPy argparse, dedent.
+
+# PyPY adds opcode JUMP_IF_NOT_DEBUG.
+# This is the two argument form.
+assert __name__ != '__main"', 'Indent decreased below 0.'
+
+# From PyPy simple_interact.py
+# PyPy uses POP_JUMP_IF_FALSE as well as POP_JUMP_IF_TRUE
+# CPython only uses POP_JUMP_IF_TRUE
+while 1:
+    try:
+        more = 10
+    except EOFError:
+        break
+    more = len(__file__)
+    assert not more, "FOO"
+    assert not more