[PR54177] Deal with var_lowpart failure in function parameters

[Alexandre Oliva]

Uros has already taken care of the main patch for the problem, but I
feel it's appropriate to protect vt_add_function_parameter should
val_lowpart actually return NULL.

I'm checking this in as obvious.  Regstrapped on x86_64-linux-gnu and
i686-linux-gnu.


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-- 
Alexandre Oliva, freedom fighter    http://FSFLA.org/~lxoliva/
You must be the change you wish to see in the world. -- Gandhi
Be Free! -- http://FSFLA.org/   FSF Latin America board member
Free Software Evangelist      Red Hat Brazil Compiler Engineer