HybridHashMap.assumeNonFullHaystack

Setting this true doesn't give measurable speedups so set it to false for now.

struct HybridHashMap(K, V = void, alias hasher = hashOf, string keyEqualPred = defaultKeyEqualPredOf!(K), Allocator = Mallocator, BorrowCheckFlag borrowCheckFlag = BorrowCheckFlag.no, uint linearSearchMaxSize = 64, PrimeCapacityFlag primeCapacityFlag = PrimeCapacityFlag.no)
static if(!(usePrimeCapacity))
enum bool assumeNonFullHaystack;

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