[PR c+ 94827]: template parm with default requires

[Nathan Sidwell]

Jason,
this is the patch you suggested, as I understood it.  I kept 
finish_nested_require's saving of the (converted) 
current_template_parms, becase of the comment about use in diagnostics.

Is this what you meant?

boostrapped on x86_64-linux.

nathan
-- 
Nathan Sidwell
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