C++ PATCH to cp_genericize_r for c++/21123

[Jason Merrill]

The original testcase for 21123 was continuing to fail because the 
genericizer was helpfully dereferencing invisible reference parms, which 
isn't what we want in a thunk.  Fixed thus.

Tested on x86_64-pc-linux-gnu with asm thunk support disabled.  Applied 
to trunk, 4.0 and 4.1 branches.  Test in g++.dg/inherit/thunk5.C.
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