C++ PATCH for c++/66501 (wrong code with array move assignment)

[Jason Merrill]

build_vec_init was assuming that if a class has a trivial copy 
assignment, then an array assignment is trivial.  But overload 
resolution might not choose the copy assignment operator.  So this patch 
changes build_vec_init to check for any non-trivial assignment operator.

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