Identified with misc-include-cleaner.

These generic targets include multiple GPUs and will, in the future,
provide a way to build once and run on multiple GPU, at the cost of less
optimization opportunities.

Note that this is just doing the compiler side of things, device libs an
runtimes/loader/etc. don't know about these targets yet, so none of them
actually work in practice right now. This is just the initial commit to
make LLVM aware of them.

This contains the documentation changes for both this change and #76954
as well.

This change is to remove incompatible gws related functions
in order to make device-libs work correctly under -O0 for
gfx1200+

Co-authored-by: Changpeng Fang <changpeng.fang@amd.com>

Reformat one table and protect a couple of tables that we don't want to
reformat.

Summary:
 Under -O0, device-libs may still emit these instructions under conditions.
So we need to remove them with warning if not compatible.

Fixes: SWDEV-417219

Reviewers:
  arsenm, Pierre-vh and b-sumner

Differential Revision:
  https://reviews.llvm.org/D158316

Otherwise device libs still has issues at O0 (in OpenCL-CTS)

Depends on D156972 as well. They're unrelated fixes but both are needed to fix the issue.

Fixes SWDEV-402331

Reviewed By: #amdgpu, arsenm

Differential Revision: https://reviews.llvm.org/D156973

Reviewed By: arsenm, b-sumner

Differential Revision: https://reviews.llvm.org/D148906