* Change variable-indirection pass to occur after closure analysis.

* Change variable-indirection pass to occur after closure analysis.
Disable variable-indirection if either the source or target variable
is closed-over.

* Change RTL code-compression to permit compression of
`offset-address' expressions across multiple instructions.  Add two
new rules needed to accomplish this for the standard static-link setup
code.  The goal of this modification is to permit the use of the "pea"
instruction when pushing static-links.