c/c++: Add fix-it hints for suggested missing #includes

c/c++: Add fix-it hints for suggested missing #includes

gcc/c-family/ChangeLog:
	* c-common.c (try_to_locate_new_include_insertion_point): New
	function.
	(per_file_includes_t): New typedef.
	(added_includes_t): New typedef.
	(added_includes): New variable.
	(maybe_add_include_fixit): New function.
	* c-common.h (maybe_add_include_fixit): New decl.

gcc/c/ChangeLog:
	* c-decl.c (implicitly_declare): When suggesting a missing
	#include, provide a fix-it hint.

gcc/cp/ChangeLog:
	* name-lookup.c (get_std_name_hint): Add '<' and '>' around
	the header names.
	(maybe_suggest_missing_header): Update for addition of '<' and '>'
	to above.  Provide a fix-it hint.
	* pt.c: Include "gcc-rich-location.h"
	(listify): Attempt to add fix-it hint for missing
	#include <initializer_list>.
	* rtti.c: Include "gcc-rich-location.h".
	(typeid_ok_p): Attempt to add fix-it hint for missing
	#include <typeinfo>.

gcc/testsuite/ChangeLog:
	* g++.dg/cpp0x/missing-initializer_list-include.C: New test case.
	* g++.dg/lookup/missing-std-include-2.C: New test case.
	* g++.dg/lookup/missing-std-include-3.C: New test case.
	* g++.dg/rtti/missing-typeinfo-include.C: New test case.
	* gcc.dg/missing-header-fixit-1.c: New test case.
	* gcc.dg/missing-header-fixit-2.c: New test case.
	* gcc.dg/missing-header-fixit-2.h: New header.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@250203 138bc75d-0d04-0410-961f-82ee72b054a4