C++ PATCH for c++/47301 (ICE with constexpr, array and -fabi-version=1)

[Jason Merrill]

The code for backwards-compatibility with ABI v1 didn't do too well with 
the case of a literal class used as an array bound; it built up an 
integral MINUS_EXPR with it directly, which doesn't make much sense. 
But since 3.2 didn't support constexpr, we can just disable the v1 
semantics when we are dealing with a literal class.

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