[libcxx-commits] [libcxx] [libcxxabi] [libunwind] [libcxx][CI] Prepare ARM Picolibc builds for upgrade to clang 21 (PR #158300)

[David Spickett via libcxx-commits]

DavidSpickett wrote:

Arm colleagues alerted me to the fact that picolibc does have some code to handle this `ALIGN_WITH_INPUT` thing when lld is used. Either CI is using a too old verison of picolibc, or that code is not triggering.

To keep each change simple, I'm going ahead with this PR, then I'll work out if we can in fact get lld working and send another PR if so.

https://github.com/llvm/llvm-project/pull/158300