SF patch [ 597919 ] compiler package and SET_LINENO

A variety of changes from Michael Hudson to get the compiler working
with 2.3.  The primary change is the handling of SET_LINENO:

# The set_lineno() function and the explicit emit() calls for
# SET_LINENO below are only used to generate the line number table.
# As of Python 2.3, the interpreter does not have a SET_LINENO
# instruction.  pyassem treats SET_LINENO opcodes as a special case.

A few other small changes:
 - Remove unused code from pycodegen and pyassem.
 - Fix error handling in parsermodule.  When PyParser_SimplerParseString()
   fails, it sets an exception with detailed info.  The parsermodule
   was clobbering that exception and replacing it was a generic
   "could not parse string" exception.  Keep the original exception.

Lib/compiler/symbols.py

@@ -249,6 +249,9 @@ class SymbolVisitor:
         scope = ClassScope(node.name, self.module)
         if parent.nested or isinstance(parent, FunctionScope):
             scope.nested = 1
+        if node.doc is not None:
+            scope.add_def('__doc__')
+        scope.add_def('__module__')
         self.scopes[node] = scope
         prev = self.klass
         self.klass = node.name