[RFA] Patch for PR c++/17395

[Dodji Seketeli]

Hello,

In the example embedded in the patch g++ gets stuck in an infinite
recursion while tsubst-ing the type of the function template:

template<class T>
void bhar(T a, X<sizeof(a)>);

During tsubst-ing of the argument X<sizeof(a)> we end up tsubst-ing the
PARM_DECL 'a' as part of the sizeof((a) expression. That's in
tusbt_decl, in the PARM_DECL case. At the end of that case, we then
tsubst the next PARM_DECL chained to the a PARM_DECL. And that's
X<sizeof(a)> again ... hence the infinite recursion.

The attached patch breaks that recursion.

It bootstraps and passes regtests on trunk and gcc-4_4-branch. The
patch won't apply to gcc-4_3-branch as that code base is too different
from the newer branches.

OK to commit to trunk and gcc-4_4-branch ?

Thanks.

-- 
Dodji Seketeli
Red Hat, Inc
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