generic.texi (ANNOTATE_EXPR): Document 3rd operand.

	* doc/generic.texi (ANNOTATE_EXPR): Document 3rd operand.
	* cfgloop.h (struct loop): Add unroll field.
	* function.h (struct function): Add has_unroll bitfield.
	* gimplify.c (gimple_boolify) <ANNOTATE_EXPR>: Deal with unroll kind.
	(gimplify_expr) <ANNOTATE_EXPR>: Propagate 3rd operand.
	* loop-init.c (pass_loop2::gate): Return true if cfun->has_unroll.
	(pass_rtl_unroll_loops::gate): Likewise.
	* loop-unroll.c (decide_unrolling): Tweak note message.  Skip loops
	for which loop->unroll==1.
	(decide_unroll_constant_iterations): Use note for consistency and
	take loop->unroll into account.  Return early if loop->unroll is set.
	Fix thinko in existing test.
	(decide_unroll_runtime_iterations): Use note for consistency and
	take loop->unroll into account.
	(decide_unroll_stupid): Likewise.
	* lto-streamer-in.c (input_cfg): Read loop->unroll.
	* lto-streamer-out.c (output_cfg): Write loop->unroll.
	* tree-cfg.c (replace_loop_annotate_in_block) <annot_expr_unroll_kind>:
        New case.
	(replace_loop_annotate) <annot_expr_unroll_kind>: Likewise.
	(print_loop): Print loop->unroll if set.
	* tree-core.h (enum annot_expr_kind): Add annot_expr_unroll_kind.
	* tree-inline.c (copy_loops): Copy unroll and set cfun->has_unroll.
	* tree-pretty-print.c (dump_generic_node) <annot_expr_unroll_kind>:
	New case.
	* tree-ssa-loop-ivcanon.c (try_unroll_loop_completely): Bail out if
	loop->unroll is set and smaller than the trip count.  Otherwise bypass
	entirely the heuristics if loop->unroll is set.  Remove dead note.
	Fix off-by-one bug in other note.
	(try_peel_loop): Bail out if loop->unroll is set.  Fix formatting.
	(tree_unroll_loops_completely_1): Force unrolling if loop->unroll
	is greater than 1.
	(tree_unroll_loops_completely): Make static.
	(pass_complete_unroll::execute): Use correct type for variable.
	(pass_complete_unrolli::execute): Fix formatting.
	* tree.def (ANNOTATE_EXPR): Add 3rd operand.
ada/
	* gcc-interface/trans.c (gnat_gimplify_stmt) <LOOP_STMT>: Pass 3rd
	operand to ANNOTATE_EXPR and also pass unrolling hints.
c/
	* c-parser.c (c_parser_while_statement): Pass 3rd operand to
	ANNOTATE_EXPR.
	(c_parser_do_statement): Likewise.
	(c_parser_for_statement): Likewise.
cp/
	* pt.c (tsubst_expr) <ANNOTATE_EXPR>: Recurse on 3rd operand.
	* semantics.c (finish_while_stmt_cond): Pass 3rd operand to
	ANNOTATE_EXPR.
	(finish_do_stmt): Likewise.
	(finish_for_cond): Likewise.
fortran/
	* trans-stmt.c (gfc_trans_forall_loop): Pass 3rd operand to
	ANNOTATE_EXPR.

From-SVN: r255106