C++ PATCH for c++/70141 (wrong partial specialization error)

[Jason Merrill]

The code in for_each_template_parm_r to walk into the RHS of 
TYPENAME_TYPE only when there isn't a predicate seemed nonsensical, and 
removing the condition didn't break anything in the testsuite.

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