Issue #21201: Improves readability of multiprocessing error message from server to client for certain exceptions

required for PGO linking - to be a configure time error rather than
make time when --with-optimizations is enabled.  Also improve our
ability to find the llvm-profdata tool on MacOS and some Linuxes.

between runs given the same Grammar.txt input regardless of the hash
randomization setting.

Backport of 186bb8dc5540 from 3.5.  Done in 2.7 per the lib2to3 exemption.

It is unused. It also forces a 16-byte alignment, which creates problems because
Python's allocator only uses 8-byte alignment.

Apparently the test succeeds on XP.

This test should always raise RuntimeError.

The tests no longer attempt to figure out if a soundcard or particular
system sounds are available.  Instead, it just tries everything and
accepts RuntimeError as a flavor of success.

Also, don't run it if 'gui' is not requested.  Patch by Xiang Zhang.

(Omitted for 2.7 from previous patch.)

Issue #27934: Use float.__repr__ instead of plain repr when JSON-encoding an instance of a float subclass. Thanks Eddie James.

Issue #27888: Prevent Windows installer from displaying console windows and failing when pip cannot be installed/uninstalled.

Issue #27870: A left shift of zero by a large integer no longer attempts to allocate large amounts of memory.