re PR ipa/44563 (GCC uses a lot of RAM when compiling a large numbers of functions)

re PR ipa/44563 (GCC uses a lot of RAM when compiling a large numbers of functions)

2015-03-12  Richard Biener  <rguenther@suse.de>

	PR middle-end/44563
	* tree-inline.c (gimple_expand_calls_inline): Walk BB backwards
	to avoid quadratic behavior with inline expansion splitting blocks.
	* tree-cfgcleanup.c (cleanup_tree_cfg_bb): Do not merge block
	with the successor if the predecessor will be merged with it.
	* tree-cfg.c (gimple_can_merge_blocks_p): We can't merge the
	entry block with its successor.

From-SVN: r221410