[clang] [llvm] [OpenACC] Switch Clang to use the Flang 'appertainment' rules for cla… (PR #135372)

[Erich Keane via cfe-commits]

erichkeane wrote:

> > Clang/Flang disagree whether 'seq' and 'self' can appear on the same serial-loop construct. I see no prose to support this?
> 
> `seq` and `self` are not in the same set for `serial loop` and seems to be accepted. https://godbolt.org/z/dzdoE3xKr

This one seems to be a mistake with how I was doing 'exclusive'.  I struck out some of them, so I'll strike out this one as well.

https://github.com/llvm/llvm-project/pull/135372