C++ PATCH for c++/47950 (ICE with condition in template)

[Jason Merrill]

The problem here was that we were folding the initializer too many 
times, so we lost the TREE_CONSTANT on the TARGET_EXPR.  Since we 
already fold in cp_parser_initializer_clause, it's redundant to do so in 
cp_parser_condition as well.

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