Actually don't free values in RandAA.reserve.

Fixes issues with corrupted values under GC load.

Author: s-ludwig

engine/source/dmdscript/RandAA.d

@@ -510,7 +510,6 @@ public:
         // handle it.
         GC.free(cast(void*)this._keys);
         GC.free(cast(void*)this.flags);
-        GC.free(cast(void*)this.vals);
 
         static if(storeHash)
         {