C++ PATCH for c++/69009 (ICE with partial specialization of variable template)

[Jason Merrill]

In this testcase, instantiate_decl was trying to look up an 
instantiation of a partial specialization using the arguments for the 
partial specialization on the primary template, which finds a different 
instance of the template.  Fixed by reconstructing the arguments to the 
primary template.

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