re PR c++/55337 (ICE tree check: expected sizeof_expr, have alignof_expr in cp_tree_equal, at cp/tree.c:2608)
PR c++/55337
* tree.c (cp_tree_equal) <case ALIGNOF_EXPR>: Use SIZEOF_EXPR_TYPE_P
only on SIZEOF_EXPR.
* g++.dg/template/alignof2.C: New test.
From-SVN: r193558
