Support for more target platforms

Hi there,

thank you for your great work to make the llvm toolchain hermetic available in bazel, this helps alot! Especially the bazel module integration is really helpful.

It is possible to integrate other target platforms? I think for example arm would be very interesting for many people.

best regards,

Daniel

The issue requests additional target-platform support, specifically ARM, for the Bazel LLVM toolchain, but names no files, tests, or entry points. Start by locating the existing target-platform configuration and its validation coverage; done would mean a defined and tested path for the requested platform.

Written by the indexing model from the issue text.