C++ PATCH for c++/48166 (ICE with invalid function-cv-quals)

[Jason Merrill]

I missed one case where we needed to change cp_type_quals to 
type_memfn_quals.  After that fix we gave the correct error, but still 
ICEd, so to avoid that I go ahead and strip the offending cv-quals.

Tested x86_64-pc-linux-gnu, applying to trunk, will apply to 4.6.1 after 
4.6.0 release.
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