[NFC][TLI] Improve tests for ArmPL and SLEEF Intrinsics. (#73352)

Auto-generate test `armpl-intrinsics.ll` and simplify tests:
- Eliminate scalar tail with no tail-folding flag.
- Use active lane mask for shorter check lines (no long `shufflevectors`).
- Eliminate scalar loops by providing `noalias` to relevant arguments and
run `simplifycfg` to drop them.
- Update script now use `@llvm.compiler.used` instead of a longer regex.