Reintroduce getVarName() method.
Reintroduce getVarName() method.

This was in the SSA aspect which was removed earlier.

Migrated from Sable/mclab@6a789bfa69c89af38677d65880104391b5a60a8d

Sable/mclab-core,Sable/mclab-core,Sable/mclab-core,Sable/mclab-core,Sable/mclab-core,Sable/mclab-core,Sable/mclab-core,Sable/mclab-core