[PTX] Another libcall patch

[Nathan Sidwell]

I've committed this further cleanup of function decl recording.  We were 
recording libcalls during call expansion, but recording other calls during  call 
outputting.  This moves all recording to the call outputting.  The recording 
helpers were a little confusing -- for intsance 'record_fndecl', was really 
'maybe_record_fndecl', and in some cases the caller checked preconditions (like 
being  an actual  fnddecl) whereas other cases the helper did the checking. 
I've moved things around so that the caller always does the prechecking.  I 
broke the libcall hash manipulation out into a helper, in line with the other 
helpers,  and added a helper to deal with looking through symbol refs.

Finally expand_movdi had no need to register an fndecl itself -- it's already 
calling maybe_convert_symbolic_operand, which does that.

nathan
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