[llvm][Support] Implement raw_socket_stream::read with optional timeout (#92308)

This PR implements `raw_socket_stream::read`, which overloads the base
class `raw_fd_stream::read`. `raw_socket_stre

[llvm][Support] Implement raw_socket_stream::read with optional timeout (#92308)

This PR implements `raw_socket_stream::read`, which overloads the base
class `raw_fd_stream::read`. `raw_socket_stream::read` provides a way to
timeout the underlying `::read`. The timeout functionality was not added
to `raw_fd_stream::read` to avoid needlessly increasing compile times
and allow for convenient code reuse with `raw_socket_stream::accept`,
which also requires timeout functionality. This PR supports the module
build daemon and will help guarantee it never becomes a zombie process.

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[llvm][Support] ListeningSocket::accept returns operation_canceled if FD is set to -1 (#89479)

If `::poll` returns and `FD` equals -1, then `ListeningSocket::shutdown`
has been called. So, regardle

[llvm][Support] ListeningSocket::accept returns operation_canceled if FD is set to -1 (#89479)

If `::poll` returns and `FD` equals -1, then `ListeningSocket::shutdown`
has been called. So, regardless of any other information that could be
gleaned from `FDs.revents` or `PollStatus`, it is appropriate to return
`std::errc::operation_canceled`. `ListeningSocket::shutdown` copies
`FD`'s value to `ObservedFD` then sets `FD` to -1 before canceling
`::poll` by calling `::close(ObservedFD)` and writing to the pipe.

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[llvm][Support] Improvements to ListeningSocket functionality and documentation (#84710)

Improvements include
* Enable `ListeningSocket::accept` to timeout after a specified amount
of time or bloc

[llvm][Support] Improvements to ListeningSocket functionality and documentation (#84710)

Improvements include
* Enable `ListeningSocket::accept` to timeout after a specified amount
of time or block indefinitely
* Enable `ListeningSocket::createUnix` to handle instances where the
target socket address already exists and differentiate between
situations where the existing file does and does not already have a
bound socket
* Doxygen comments

Functionality added for the module build daemon

---------

Co-authored-by: Michael Spencer <bigcheesegs@gmail.com>

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[llvm][Support] Lift raw_socket_stream implementation out into own files (#75653)

Move the implementation of raw_socket_stream from raw_ostream.h/cpp to
raw_socket_stream.h/cpp as requested in #736

[llvm][Support] Lift raw_socket_stream implementation out into own files (#75653)

Move the implementation of raw_socket_stream from raw_ostream.h/cpp to
raw_socket_stream.h/cpp as requested in #73603.

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[llvm][Windows] Don't run socket tests on old versions of Windows

AF_UNIX sockets were added to Windows 10 build 17063 in 2017, older
versions of Windows will fail this test.

Also add a lit config

[llvm][Windows] Don't run socket tests on old versions of Windows

AF_UNIX sockets were added to Windows 10 build 17063 in 2017, older
versions of Windows will fail this test.

Also add a lit config so lit tests using sockets can do:
// REQUIRES: unix-sockets
(It would be cool if unit tests could use lit available_features)

Also fix llvm-config test that didn't fail when new libs are added.

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[llvm][Support] Add UNIX socket support (#73603)

This adds support for UNIX socket communication to work similarly to
raw_stream.

---------

Patch by Christian Riis