[PATCH v4 0/8] msvcrt: _locale_t object management overhaul

[Chip Davis]

This patch series fixes management of _locale_t objects to align more
with native. Some apps and libraries--most notably libc++--depend on
this to behave properly.

The first patch contains tests demonstrating the proper behavior of
_locale_t objects and their various members. Patches 2 through 6 copy
various portions of the threadlocinfo struct from old to new when they
aren't updated. This is all to clear the way for patch 7, which updates
the locale pointer in msvcrt itself instead of the contents of the
threadlocinfo struct. The last patch fixes the reference counting
behavior of _get_current_locale() to match native.