C++ PATCH for c++/39070

[Jason Merrill]

The problem in this PR was that we end up tsubsting the call twice: the 
first time we don't perform arg-dependent lookup, but we were passing 
true for koenig_p so we set KOENIG_LOOKUP_P on the CALL_EXPR and then 
the second time around we do try to do arg-dependent lookup, which fails 
because the call is to a template-id rather than a simple name.  Fixed 
by separating in finish_call_expr the notions of actually doing 
arg-dependent lookup and accepting the results of same.

Tested x86_64-pc-linux-gnu, applied to trunk.  Will apply to 4.3 after 
testing.

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