convert_move infinite recursion

[Alexandre Oliva]

In a 16-bit port with 32-bit SImode without a truncdisi2 instruction,
truncating a DImode value to SImode results in infinite recursion in
convert_move.

This patch uses a strategy similar to the one used right above to
truncate from multi-word to word-or-narrower, except that the existing
code truncates to word-mode then calls itself recursively (this is not
the infinite recursion call, mind you), whereas the new code uses
to_mode.

Bootstrapped on i686-pc-linux-gnu, tested in this 16-bit port.

Ok to install?

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-- 
Alexandre Oliva   Enjoy Guarana', see http://www.ic.unicamp.br/~oliva/
Red Hat GCC Developer                 aoliva@{redhat.com, gcc.gnu.org}
CS PhD student at IC-Unicamp        oliva@{lsd.ic.unicamp.br, gnu.org}
Free Software Evangelist                Professional serial bug killer