C++ PATCH for c++/67813 (wrong constexpr result)

[Jason Merrill]

My patch for 66450 improved a previous problem with clobbering an 
existing value for an aggregate, but we still had the problem that the 
value in the hash table for the object was different from the value in 
ctx->ctor, so changing one didn't update the other.  This patch makes 
sure they're in sync.

Tested x86_64-pc-linux-gnu, applying to trunk and 5.
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