re PR ipa/91062 (gcc.dg/ipa/ipa-pta-1.c dump contains garbage when gcc was configured with --enable-checking=all)

2019-07-04  Richard Biener  <rguenther@suse.de>

	PR ipa/91062
	* tree-pass.h (execute_all_ipa_transforms): Add a flag
	parameter whether to disable GC collection.
	* passes.c (execute_one_ipa_transform_pass): Likewise, and
	honor it.
	(execute_all_ipa_transforms): Likewise and pass it down.
	* cgraph.c (cgraph_node::get_body): Do not invoke garbage
	collection from applying IPA transforms.
	* cgraphunit.c (cgraph_node::expand): Allow garbage collection
	from applying IPA transforms.

From-SVN: r273083