Modifying the datatype of a formal parameter

[Matt Davis]

I am using 'ipa_modify_formal_parameters()' to change the type of a function's
formal parameter.  After my pass completes, I get a 'gimple_expand_cfg()'
error. I must be missing some key piece here, as the failure points to a NULL
"SA.partition_to_pseudo" value.  I also set_default_ssa_name() on the returned
value from ipa_modify_formal_parameter (the adjustment's 'reduction' field).  Do
I need to re-gimplify the function or run some kind of 'cleanup' or 'update'
once I modify this formal parameter?

Thanks

-Matt