re PR fortran/48636 (Enable more inlining with -O2 and higher)

	PR fortran/48636
	* ipa-inline.c (want_inline_small_function_p): Take loop_iterations hint.
	(edge_badness): Likewise.
	* ipa-inline.h (inline_hints_vals): Add INLINE_HINT_loop_iterations.
	(inline_summary): Add loop_iterations.
	* ipa-inline-analysis.c: Include tree-scalar-evolution.h.
	(dump_inline_hints): Dump loop_iterations.
	(reset_inline_summary): Free loop_iterations.
	(inline_node_duplication_hook): Update loop_iterations.
	(dump_inline_summary): Dump loop_iterations.
	(will_be_nonconstant_expr_predicate): New function.
	(estimate_function_body_sizes): Analyze loops.
	(estimate_node_size_and_time): Set hint loop_iterations.
	(inline_merge_summary): Merge loop iterations.
	(inline_read_section): Stream in loop_iterations.
	(inline_write_summary): Stream out loop_iterations.

From-SVN: r190556