* attribs.c (decl_attributes): Imply noinline, noclone and no_icf
	attributes for noipa attribute.  For naked attribute use
	lookup_attribute first before lookup_attribute_spec.
	* final.c (rest_of_handle_final): Disable IPA RA for functions with
	noipa attribute.
	* ipa-visibility.c (non_local_p): Fix comment typos.  Return true
	for functions with noipa attribute.
	(cgraph_externally_visible_p): Return true for functions with noipa
	attribute.
	* cgraph.c (cgraph_node::get_availability): Return AVAIL_INTERPOSABLE
	for functions with noipa attribute.
	* doc/extend.texi: Document noipa function attribute.
	* tree-ssa-structalias.c (refered_from_nonlocal_fn): Set *nonlocal_p
	also for functions with noipa attribute.
	(ipa_pta_execute): Set nonlocal_p also for nodes with noipa attribute.
c-family/
	* c-attribs.c (c_common_attribute_table): Add noipa attribute.
	(handle_noipa_attribute): New function.
testsuite/
	* gcc.dg/attr-noipa.c: New test.
	* gcc.dg/ipa/ipa-pta-18.c: New test.
	* gcc.dg/ipa/ipa-sra-11.c: New test.

From-SVN: r250607