update blkinfo chache in array.reserve
Merge pull request #548 from rainers/fix10593

fix  Issue 10593 - array's reserve/capacity go haywire if length has been changed prior
key is unaltered
remove unused AA vararg functions
remove old TODO comment

- We are not going to replace the current AA signatures which take
  an extra parameter for the value size, because getting it from
  TypeInfo_AssociativeArray instead required another virtual call.
remove dead&rotten code
Merge pull request #549 from dawgfoto/cleanupAA

Cleanup AA