PR c/39495
* c-parser.c (c_parser_omp_for_loop): Call c_parser_binary_expression
instead of c_parser_expression_conv, if original_code isn't one of the
4 allowed comparison codes, fail.
* semantics.c (handle_omp_for_class_iterator): Swap cond operands and
code if iter is the second operand.
* parser.c (cp_parser_binary_expression): Add no_toplevel_fold_p
argument. If it is set, don't build the toplevel expression with
build_x_binary_op, but build2.
(cp_parser_assignment_expression, cp_parser_omp_for_incr): Adjust
callers.
(cp_parser_omp_for_cond): Don't assume the first operand of the
comparison must be decl.
* gcc.dg/gomp/pr39495-2.c: Remove xfails.
* testsuite/libgomp.c/loop-12.c: New test.
* testsuite/libgomp.c/loop-11.c: New test.
* testsuite/libgomp.c++/loop-11.C: New test.
* testsuite/libgomp.c++/loop-12.C: New test.
* testsuite/libgomp.c++/for-8.C: New test.
From-SVN: r145014
