graphql / graphql-js / 632

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[Validation] Memoize collecting variable usage.

During multiple validation passes we need to know about variable usage within a de-fragmented operation. Memoizing this ensures each pass is O(N) - each fragment is no longer visited per operation, but once total.

In doing so, `visitSpreadFragments` is no longer used, which will be cleaned up in a later PR

56 of 56 new or added lines in 5 files covered. (100.0%)

5433 of 5468 relevant lines covered (99.36%)

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