C++ PATCHes for inheriting ctor issues

[Jason Merrill]

When I implemented inheriting constructors, I thought that the wording 
that said that base copy/move constructors are not inherited was a 
wording problem, but discussion on the reflector indicates that it was 
intended, so that wrapper classes act like strong typedefs rather than 
drop-in replacements.  So the first patch implements that.

In 55261 we were using CLASSTYPE_CONSTRUCTORS while the type still had 
undeclared lazy constructors, so we need to use lookup_fnfields to get 
the lazy declarations.

For 55262 we need to set DECL_PARM_INDEX on the inherited parameters.

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