[clang] [lld] [llvm] [clang][MIPS] Add support for mipsel-windows-* targets (PR #107744)

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=?utf-8?q?Hervé?= Poussineau <hpoussin at reactos.org>,
=?utf-8?q?Hervé?= Poussineau <hpoussin at reactos.org>,
=?utf-8?q?Hervé?= Poussineau <hpoussin at reactos.org>,
=?utf-8?q?Hervé?= Poussineau <hpoussin at reactos.org>,
=?utf-8?q?Hervé?= Poussineau <hpoussin at reactos.org>,
=?utf-8?q?Hervé?= Poussineau <hpoussin at reactos.org>,
=?utf-8?q?Hervé?= Poussineau <hpoussin at reactos.org>,
=?utf-8?q?Hervé?= Poussineau <hpoussin at reactos.org>,
=?utf-8?q?Hervé?= Poussineau <hpoussin at reactos.org>,
=?utf-8?q?Hervé?= Poussineau <hpoussin at reactos.org>,
=?utf-8?q?Hervé?= Poussineau <hpoussin at reactos.org>,
=?utf-8?q?Hervé?= Poussineau <hpoussin at reactos.org>
Message-ID:
In-Reply-To: <llvm.org/llvm/llvm-project/pull/107744 at github.com>


hpoussin wrote:

> Is there any documentation for calling conventions/exception-handling/etc. for Mips? Do we need to distinguish Windows NT Mips from Windows CE Mips?

Official Microsoft documentation for Windows CE MIPS is on [MSDN](https://learn.microsoft.com/en-us/previous-versions/windows/embedded/ms864304(v=msdn.10))
Raymond Chen described MIPS on his blog, including [calling convention](https://devblogs.microsoft.com/oldnewthing/20180417-00).

He also noted that:
`The documentation was originally written for Windows CE, but I figure they are still true for Windows NT, because why not reuse the compiler you already have?`

https://github.com/llvm/llvm-project/pull/107744