[6.2] Add optional language features to the supported features output #81971
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Follow-up to #81744
Explanation:
One commit got lost while cherry-picking Make
InferIsolatedConformances
andStrictMemorySafety
migratable features #81703 to 6.2:Optional language features don't have a specific "-enable-*" flag, because they're rare and don't fit the same upcoming/experimental distinction. Add a flag_name field to provide the flag name as well.
Main Branch PR: Make
InferIsolatedConformances
andStrictMemorySafety
migratable features #81703 (specifically one commit - 414adb5)Risk: Low. Only enabled by new compilation flags, only create new warnings or re-use existing ones.
Reviewed By: @DougGregor
Testing: Updated existing test-case.
(cherry picked from commit 414adb5)