[clang] [llvm] [win][x64] Add support for Windows x64 unwind v3 (PR #200249)

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Andarwinux wrote:

> > I found a way to get a reduced IR reproducer.
> > [reduced.ll.txt](https://github.com/user-attachments/files/28805989/reduced.ll.txt)
> > ```
> > clang -O3 -march=tigerlake --target=x86_64-pc-windows-gnu -c reduced.ll
> > <unknown>:0: error: value of 65699 is too large for field of 2 bytes
> > error: cannot compile inline asm
> > 1 error generated.
> > ```
> 
> Perfect - hitting the epilog offset limit, so here's the fix #203108
> 
> It works for your reduced repro, can you please try for the full repro?

Thanks, I can confirm it works.

https://github.com/llvm/llvm-project/pull/200249