tree-cfg.c (gimple_redirect_edge_and_branch): Change ERROR_MARK to GIMPLE_ERROR_MARK.

tree-cfg.c (gimple_redirect_edge_and_branch): Change ERROR_MARK to GIMPLE_ERROR_MARK.

./:	* tree-cfg.c (gimple_redirect_edge_and_branch): Change ERROR_MARK
	to GIMPLE_ERROR_MARK.

	* c-typeck.c (build_conditional_expr): Add op1_original_type and
	op2_original_type parameters.  Warn about using different enum
	types.
	* c-parser.c (c_parser_conditional_expression): Pass original
	types to build_conditional_expr.
	* c-tree.h (build_conditional_expr): Update declaration.
testsuite/:
	* gcc.dg/Wcxx-compat-18.c: New testcase.

From-SVN: r148727