re PR c++/47326 ([C++0x] ICE in tsubst_copy (triggered by dependency of return type on parameter pack size))

PR c++/47326

gcc/cp/

	PR c++/47326
	* pt.c (tsubst_copy)<case SIZEOF_EXPR>: Ensure that even pack
	expansion arguments are not evaluated.

gcc/testsuite/

	PR c++/47326
	* g++.dg/cpp0x/variadic106.C: New test.

From-SVN: r170222