C++ PATCH for c++/53599 (ICE with local class in template)

[Jason Merrill]

The problem here was that when we instantiate G::bar, we want to 
instantiate F, and end up improperly pushing the declaration inside G, 
which leads to the ICE.  Adjusting the call to pushclass is enough to 
fix this, which is what I propose doing for the 4.7 branch.  For 4.8 I'm 
going to do more.

Richard: I think we need to resolve 53599 for 4.7.1, either by reverting 
the fix for 53137 or applying this patch.  Do you have a preference?
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