bpo-40222: "Zero cost" exception handling (GH-25729)

"Zero cost" exception handling.

* Uses a lookup table to determine how to handle exceptions.
* Removes SETUP_FINALLY and POP_TOP block instructions, eliminating (most of) the runtime overhead of try statements.
* Reduces the size of the frame object by about 60%.

Lib/test/test_code.py

@@ -227,6 +227,7 @@ class CodeTest(unittest.TestCase):
                         co.co_name,
                         co.co_firstlineno,
                         co.co_lnotab,
+                        co.co_exceptiontable,
                         co.co_freevars,
                         co.co_cellvars)