Message7965

The codeop.Compile class doesn't expose the compiler flags
as expected (as a "flags" attribute).  The flags seem to be
properly implemented in the com.python.core.CompilerFlags
class, but aren't exposed -- they're exposed as _cflags, but
this is a instance of org.python.core.CompilerFlags.

For instance, IPython tries to enable the PyCF_ONLY_AST flag
for it's caching compiler subclass by or-ing it to an expected
`flags` attribute.

The bit values of the constants implemented in com.python.core.CompilerFlags seem to match the CPython
implementation at a first glance.