TIClang: Make ARM architecture id uppercase
The initial compiler support implemented in commit 9ba0a545 (TIClang:
Add support for TI Clang-based compilers, including tiarmclang,
2023-12-06) introduced Arm
as architecture instead of ARM
which is
used for all other compilers.
Please reject this MR if it was on purpose. I just saw it while working on another compiler.
If needed this change may be rebased to v3.29, where it was initially implemented in !9228 (merged)
Backport: release
Manual-backport: release-3.31
Manual-backport: release-3.30
Manual-backport: release-3.29
Edited by Brad King