[lto] PATCH: new CALL_EXPR constructors

[Sandra Loosemore]

This is my last set of patches in preparation for changing the low-level 
representation of CALL_EXPRs to push the arguments into the expr node itself 
instead of pointing to a TREE_LIST.  Here, I've "broken" build3 and fold_build3 
as constructors for tcc_vl_exp objects, introduced a new set of low-level 
constructors for CALL_EXPR-like objects, and propagated the changes around.  I 
also fixed up a few more places that weren't yet using the new abstract 
interface for CALL_EXPRs.

Any comments or complaints before I commit this?

I'm planning to actually hack the representation next, and see what breaks.  :-P

-Sandra

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