An SSA variable that is defined by a
Gets an access of the SSA source variable underlying this SSA variable that can be reached from this SSA variable without passing through any other uses, but potentially through phi nodes and uncertain implicit updates.
Gets an access of this SSA variable.
Gets a definition that ultimately defines this variable and is not itself a phi node.
Gets the SSA source variable underlying this SSA variable.
Holds if this SSA variable is live at the end of