C++ PATCH for c++/48289 (-pedantic breaks std::move)

[Jason Merrill]

The problem here was that we were improperly treating 
static_cast<std::remove_reference<T>::type&&>(x) as an lvalue because 
the dereference was inside a NON_DEPENDENT_EXPR, which we always treat 
as an lvalue.  That seems like a bad assumption, but we can fix this bug 
simply by moving the dereference outside.

Tested x86_64-pc-linux-gnu, applied to trunk and 4.5, will apply to 4.6 
after 4.6.0.
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