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

[Martin Storsjö via cfe-commits]

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+; RUN: llc -mtriple mipsel-windows-msvc -filetype=obj < %s | obj2yaml | FileCheck %s
+; RUN: llc -mtriple mipsel-windows-gnu -filetype=obj < %s | obj2yaml | FileCheck %s
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mstorsjo wrote:

It feels to me like this test skips a couple steps.

It would be better to separate things out entirely; in `test/CodeGen/Mips`, you'd have a test that takes `.ll` and generates assembly, where you check the related aspects. (They're probably quite unspectacular at this point, that's fine. And if that's irrelevant at this point, perhaps that test can be skipped or deferred to a later patch?) Then in `test/MC/Mips`, you'd have a test that takes `.s` assembly input and verifies the output aspects of it. Such tests more often would use e.g. `objdump -d -r` rather than `obj2yaml` for inspecting the output object file too.

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