Memory leaks in Generics.Collections.THashSet

I accidentally discovered that calling any THashSet method of the four:

• UnionWith()
• IntersectWith()
• ExceptWith()
• SymmetricExceptWith()

leads to memory leaks (see test.pas).

The attached patch seems to fix the situation.

The same seems to be observed in TSortedHashSet, so a new patch has been added.

test.pashashset.patch gencoll.patch

OMG, in TSortedSet everything seems to be the same.

gencoll2.patch