offset - a client-defined offset, that may or may not represent a valid location within
the instruction sequence used to build this AST. In practice, this offset should
be an IR instruction one.
name - mandatory label name, should be unique, or the method will throw an exception.
Create a named label. The label will be auto-generated from the provided address.
Parameters:
offset - a client-defined offset, that may or may not represent a valid location within
the instruction sequence used to build this AST. In practice, this offset should
be an IR instruction one.