C++ PATCH to use VEC_INIT_EXPR for array mem-initializers

[Jason Merrill]

Our implementation of constexpr constructors involves walking the trees 
generated for the mem-initializers of a constructor and building up a 
simpler representation for use at expansion time.  When we're dealing 
with an array member, this has meant trying to parse the output of 
build_vec_init, which is daunting.  This patch changes 
perform_member_init to generate a VEC_INIT_EXPR instead, which is much 
easier to analyze.

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