PR c++/29000
        * pt.c (build_non_dependent_expr, type_dependent_expression_p):
        Look inside STMT_EXPR.
        * semantics.c (stmt_expr_value_expr): New fn.
        * cp-tree.h: Declare it.
        * g++.dg/ext/stmtexpr12.C: New test.

From-SVN: r127868