re PR c++/53658 (internal compiler error -- segmentation fault)

/cp
2013-06-07  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/53658
	* pt.c (lookup_template_class_1): Consistently use TYPE_MAIN_DECL,
	not TYPE_STUB_DECL, to access the _DECL for a _TYPE.

/testsuite
2013-06-07  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/53658
	* g++.dg/cpp0x/alias-decl-36.C: New.

From-SVN: r199793