[compiler-rt] [libcxx] CompilerRT: Normalize COMPILER_RT_DEFAULT_TARGET_TRIPLE (PR #89234)

[Peter Waller via llvm-commits]

peterwaller-arm wrote:

> In current code, aarch64-none-elf is normalized to aarch64-unknown-none-elf.

What is puzzling is that it's being normalized here to `aarch64-none-unknown-elf`, i.e. none and unknown are in the wrong order compared to what I expect. In the PR body you wrote:

> libcxx/utils/ci/run-buildbot is also updated to use armv7m-none-unknown-eabi 

This also looks suspicious, I'm expecting `unknown-none`, not `none-unknown`.

https://github.com/llvm/llvm-project/pull/89234