C++ PATCH for c++/42655 (wrong type for !x)

[Jason Merrill]

The underlying problem here is that invert_truthvalue_loc is making the 
assumption that the type of its argument is the right type for the 
result.  We could strip cv quals there, but it's simple enough to strip 
them in the front end first, by making rvalue conversions drop cv quals 
as they ought.

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