Summary:
LLVM-15 has a warning `-Wunused-but-set-variable` which we treat as an error because it's so often diagnostic of a code issue. Unused variables can compromise readability or, worse, performance.
This diff either (a) removes an unused variable and, possibly, it's associated code, or (b) qualifies the variable with `[[maybe_unused]]`, mostly in cases where the variable _is_ used, but, eg, in an `assert` statement that isn't present in production code.
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Reviewed By: luciang
Differential Revision: D42465117
fbshipit-source-id: 64e7dec0eecaa4e3c50d4fea5ffd1c57cd8b58d7
567988736d