Rollup merge of #125472 - erikdesjardins:component, r=clubby789

tidy: validate LLVM component names in tests

LLVM component names are not immediately obvious (they usually omit any suffixes on the target arch name), and if they're incorrect, the test will silently never run.

This happened [here](rust-lang/rust#125220 (comment)), and it would be nice to prevent it.

Author: matthiaskrgr