Backport fix for INV buffer #314
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(cherry picked from commit bitcoin/bitcoin@037159c) Zcash: Adapted for our lack of direct headers announcement. (cherry picked from commit zcash/zcash/df24ea9bd29e13c018c389e32f8e6c669786b173)
vToFetch is never used after declaration. When checked if not empty, evaluation is always false. Best case scenario this is optimized by the compiler, worst case it wastes cpu cycles. It should be removed either way. (cherry picked from commit bitcoin/bitcoin@c707ca8) Zcash: Adjusted for us not having backported various refactors. (cherry picked from commit 814e320)
Headers-first is the primary method of announcement on the network. If a node fell back sending blocks by inv, it's probably for a re-org. The final block hash provided should be the highest, so send a getheaders and then fetch the blocks we need to catch up. (cherry picked from commit bitcoin/bitcoin@7467366) Zcash: Adjusted for us not having backported various refactors. (cherry picked from commit zcash/zcash/52cd44c7c80f0255fe6a5b8dc73c8343aade2501)
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Cherry-picked from zcash#6927