[clang] [llvm] [MIPS] LLVM data layout give i128 an alignment of 16 for mips64 (PR #112084)

[via cfe-commits]

yingopq wrote:

> > @nikic I checked several other arch-32 situations with ForceEnableInt128, and they all use `alloca i128, align 16`. But they did not modify the target datalayout content with `i128:128`, should mips be consistent?
> 
> I think either way is fine here. Something to consider though, is that the AutoUpgrade for the DataLayout has to match. So if you don't add `i128:128` to the o32 DL, then it shouldn't get added by AutoUpgrade either.

OK, I decided to not add this.
Please help review whether there has other issue, thanks!

https://github.com/llvm/llvm-project/pull/112084