LookupCache: Clear L1 entries on dynamic cache growth

Growing widens L1PointerMask without touching the table, so an entry whose
address has the new mask bit set sits where InvalidateCache no longer looks,
and a later shrink hands it back to the JIT. Wipe [0, old) on grow, the way
the shrink wipes [new, MAX); the still-valid entries go with it.

FEXCore/Source/Interface/Core/LookupCache.h

@@ -242,6 +242,9 @@ public:
 
       if (AveragePerSecond >= DynamicL1CacheIncreaseCountHeuristic()) {
         if (CurrentL1Entries < MAX_L1_ENTRIES) {
+          // Entries whose address has the new mask bit set would be unreachable by InvalidateCache
+          FEXCore::Allocator::VirtualDontNeed(reinterpret_cast<void*>(L1Pointer), CurrentL1Entries * sizeof(LookupCacheEntry), false);
+
           CurrentL1Entries <<= 1;
           L1PointerMask = CurrentL1Entries - 1;