C++ PATCH for c++/42415 (bad assembly output for explicit constructor call)

[Jason Merrill]

DR 147 changed A::A() from a functional cast to an (ill-formed) direct 
call to the constructor.  In the testcase for 42415 we weren't catching 
the ill-formedness and therefore generated a call to the maybe-in-charge 
constructor which doesn't really exist.

Fixed thus.  -fpermissive will allow the testcase to compile as in 4.4, 
with a warning.

Tested x86_64-pc-linux-gnu, applied to trunk.
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