BCodeOpt building block: DeadStoreElimPrim

Perform dead-store elimination for local-vars
holding primitives (dead-store elimination can be performed
more aggresively for primitive values than for reference values).

Details in the documentation for
scala.tools.nsc.backend.bcode.DeadStoreElimPrim
Level 1 intra-method optimiz: Dead Store Elimination, Primitives
BCodeOpt building block: DeadStoreElimRef

Perform dead-store elimination for local-vars
holding references (dead-store elimination can be performed
more aggresively for primitive values than for reference values).

Details in the documentation for
scala.tools.nsc.backend.bcode.DeadStoreElimRef
Level 1 intra-method optimiz: Dead Store Elimination, References