gcc.c (init_gcc_specs): If HAVE_LD_AS_NEEDED, link with -lgcc --as-needed -lgcc_s --no-as-needed by default.

	* gcc.c (init_gcc_specs): If HAVE_LD_AS_NEEDED, link with
	-lgcc --as-needed -lgcc_s --no-as-needed by default.
	* configure.ac (HAVE_LD_AS_NEEDED): Check for ld --as-needed.
	* configure: Rebuilt.
	* config.in: Rebuilt.
	* Makefile.in (stage1-start): Copy also libgcc_s*$(SHLIB_EXT).
	(stage2-start, stage3-start, stage4-start): Likewise.
	(stageprofile-start, stagefeedback-start): Likewise.

Co-Authored-By: Jakub Jelinek <jakub@redhat.com>

From-SVN: r80302