C++ PATCH for c++/42358 (duplicate symbols with variadic templates)

[Jason Merrill]

The problem turned out to be a problem with hash calculation; the hash 
value computed for a specialization when it was added to the hash table 
differed from the one computed when growing the hash table, because the 
code to skip over ARGUMENT_PACK_SELECT was doing it too late, after we'd 
already included it in the hash value.

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