Instead, the re module's standard caching does its work.

(thanks "make smelly")

tests from the setUp() routine.
This fixes a refleak in test_socket on some machines.

 * Call directly the right find/rfind method: allow inlining functions
 * Remove Py_LOCAL_CALLBACK (added for any_find_slice)

Thanks to Konrad Schöbel and Jasper Schulz for helping with the mass-editing.

(found by Georg)

(found by Georg)

Closes #12192: Document that mutating list methods do not return the instance (original patch by Mike Hoy).

I want to replace custom byte-compiling function with calls to
compileall before 3.3b1, but in the short term it’s good to have this
fixed.

Adapted from the distutils patch by Jeff Ramnani.  I tested with -B, -O
and -OO; test_util and test_mixin2to3 fail in -O mode because lib2to3
doesn’t support it.