PR c++/59268
	* pt.c (tsubst_copy_and_build): Handle POINTER_PLUS_EXPR.

	* g++.dg/cpp0x/constexpr-template6.C: New test.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@205674 138bc75d-0d04-0410-961f-82ee72b054a4