[clang] [clang] check deduction consistency when partial ordering function templates (PR #100692)

[Luke Lau via cfe-commits]

lukel97 wrote:

> > I tried out #94981 and -fno-relaxed-template-template-args and can confirm both fix it. I'm now running into a separate LoopVectorizer crash, but I made it out of the frontend :)
> > Using -fno-relaxed-template-template-args should be fine, in llvm-test-suite we already do something similar for another benchmark by passing -fdelayed-template-parsing, so I'll go ahead and open up a pull request there to add the flag.
> > Thanks for all your help so far in finding a way around this!
> 
> It should work without any flags now, can you confirm?

I can confirm I'm able to build SPEC without the flag now.

https://github.com/llvm/llvm-project/pull/100692