PR c++/58109 - alignas() fails to compile with constant expression

PR c++/58109 - alignas() fails to compile with constant expression
PR c++/69022 - attribute vector_size ignored with dependent bytes

gcc/testsuite/ChangeLog:
2016-01-23  Martin Sebor  <msebor@redhat.com>

	PR c++/58109
	PR c++/69022
	* g++.dg/cpp0x/alignas5.C: New test.
	* g++.dg/ext/vector29.C: Same.

gcc/cp/ChangeLog:
2016-01-23  Martin Sebor  <msebor@redhat.com>

	PR c++/58109
	PR c++/69022
	* decl2.c (is_late_template_attribute): Handle dependent argument
 	to attribute align and attribute vector_size.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@232766 138bc75d-0d04-0410-961f-82ee72b054a4