[NFC] LocalGraph: Move definition to logical place (#6045)

allGets was declared in a scope that kept it alive for all blocks, and at
the end of the loop we clear the gets for a particular block. That's clumsy,
and makes a followup harder, so this PR moves it to the natural place for it.
(That is, it moves it to the scope that handles a particular block, and removes
the manual clearing-out of the get at the end of the loop iteration.) Optimizing
compilers are smart enough to be efficient about stack allocations
of objects inside loops anyhow (which I measured).

Helps #6042.

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