OffloadArch uses an enumerator named `UNUSED`, which is a very common
macro name in external codebases (e.g. Mesa defines UNUSED as an
attribute helper). If such a macro is visible when including
clang/Basic/OffloadArch.h, the preprocessor expands the token inside the
enum and breaks compilation of the installed Clang headers.
Rename the enumerator to `UNUSED_` and update all in-tree references.
This is a spelling-only change (no behavioral impact) and mirrors the
existing approach used for SM_32_ to avoid macro clashes.
This patch adds support for new GPU architectures introduced in CUDA
13.0 in Clang:
- SM_88: Ampere architecture variant
- SM_110/SM_110a: Blackwell architecture variants
Additionally, this patch deprecates SM_101/SM_101a support for CUDA 13.0
and later versions. The SM_101 architecture is superseded by SM_110 and
is no longer supported by CUDA 13.0+ toolchain components.
Following #137070, this PR adds an initial set of Intel `OffloadArch`
values with corresponding predicates that will be used in SYCL
offloading. More Intel architectures will be added in a future PR.
