Set SECTION_EXCLUDE flag for LTO sections.

gcc/
	* configure: Regenerate.
	* configure.ac: Move the test for section attribute specifier "e" in GAS
	out to all i[34567]86-*-* | x86_64-*-* targets and add --fatal-warnings.
	* langhooks.c (lhd_begin_section): Set SECTION_EXCLUDE flag.
	* varasm.c (default_elf_asm_named_section): Guard SECTION_EXCLUDE with
	ifdef HAVE_GAS_SECTION_EXCLUDE.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@216442 138bc75d-0d04-0410-961f-82ee72b054a4