Restore lost nuance in DeveloperPolicy regarding input languages for test cases #79527
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While re-reading the various policies for changes I've missed, I noticed that the policy on test cases had been rewritten to be a bit overly restrictive and not accurately reflect the test cases in LLVM today.
Back in 2019 (git: e0ddc73, svn: 201619), some references to llvm-gcc were removed from the DeveloperPolicy. One of these removals removed some important nuance along with the example that referenced llvm-gcc. The original text was:
and this was reduced to:
which is a bit too definite and restrictive.
This commit attempts to restore the original intent but with examples that exist in the current LLVM source.