[runtimes] Run backdeployment CI on Github hosted runners (#109984)

This removes the need for macOS nodes in Buildkite. It also moves to the
proper way of testing backdeployment, which is to actual

[runtimes] Run backdeployment CI on Github hosted runners (#109984)

This removes the need for macOS nodes in Buildkite. It also moves to the
proper way of testing backdeployment, which is to actually run on the
target OS itself, instead of using packaged dylibs from previous OS
versions and trying to emulate backdeployment with DYLD_LIBRARY_PATH.

As a drive-by change, also fix a few back-deployment annotations that
were incorrect and add support for minor versions in the Lit feature
determining availability from the target triple.

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[libc++][Android] Mark tests XFAIL/UNSUPPORTED (#69271)

Mark tests as necessary to accommodate Android L (5.0 / API 21) and up.

Add three Android lit features:
- android
- android-device-api=

[libc++][Android] Mark tests XFAIL/UNSUPPORTED (#69271)

Mark tests as necessary to accommodate Android L (5.0 / API 21) and up.

Add three Android lit features:
- android
- android-device-api=(21,22,23,...)
- LIBCXX-ANDROID-FIXME (for failures that need follow-up work)

Enable an AIX workaround in filesystem_test_helper.h for the broken
chmod on older Android devices.

Mark failing test with XFAIL or UNSUPPORTED:
- Mark modules tests as UNSUPPORTED, matching other configurations.
- Mark a gdb test as UNSUPPORTED.
- XFAIL tests for old devices that lack an API (fmemopen).
- XFAIL various FS tests (because SELinux blocks FIFO and hard linking,
because fchmodat is broken on old devices).
- XFAIL various locale tests (because Bionic has limited locale
support). (Also XFAIL an re.traits test.)
- XFAIL some print.fun tests because the error exception has no system
error string.
- Mark std::{cin,wcin} tests UNSUPPORTED because they hang with
adb_run.py on old devices.
- Mark a few tests UNSUPPORTED because they allocate too much memory.
- notify_one.pass.cpp is flaky on Android.
- XFAIL libc++abi demangler test because of Android's special long
double on x86[-64].

N.B. The `__ANDROID_API__` macro specifies a minimum required API level
at build-time, whereas the android-device-api lit feature is the
detected API level of the device at run-time. The android-device-api
value will be >= `__ANDROID_API__`.

This commit was split out from https://reviews.llvm.org/D139147.

Fixes: https://github.com/llvm/llvm-project/issues/69270

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[libcxx] [test] Add a test parameter for disabling memory intensive tests (#68214)

Specifically, the test std/input.output/string.streams/stringstream/stringstream.members/gcount.pass.cpp
allocates

[libcxx] [test] Add a test parameter for disabling memory intensive tests (#68214)

Specifically, the test std/input.output/string.streams/stringstream/stringstream.members/gcount.pass.cpp
allocates a std::string with INT_MAX-1 elements, and then writes this to
a std::stringstream. On Linux, running this test consumes around 5.0 GB
of memory; on Windows, it ends up using up to 6.8 GB of memory.

This limits whether such tests can run on e.g. GitHub Actions runners,
where the free runners are limited to 8 GB of memory.

This is somewhat similar to, but still notably different, from the
existing test parameter long_tests.

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[NFC][libc++][tests] Move directories under stringstream

Reviewed By: #libc, philnik

Spies: libcxx-commits

Differential Revision: https://reviews.llvm.org/D151884