* defaults.h (ASM_OUTPUT_ALTERNATE_LABEL_NAME): Provide default.
* emit-rtl.c (gen_label_rtx): Support LABEL_ALTERNATE_NAME.
* final.c (final_scan_insn): Emit LABEL_ALTERNATE_NAME.
* ggc-common.c (ggc_mark_rtx_children): Mark LABEL_ALTERNATE_NAME.
* jump.c (delete_unreferenced_labels): Don't delete if
LABEL_ALTERNATE_NAME is set.
* print-rtl.c (print_rtx): Dump alternate name.
* rtl.def (CODE_LABEL): Change format to "iuuis00s".
* rtl.h (LABEL_ALTERNATE_NAME): Define.
* rtl.texi (LABEL_ALTERNATE_NAME): Document.
* tm.texi (ASM_OUTPUT_ALTERNATE_LABEL_NAME): Document.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@30382 138bc75d-0d04-0410-961f-82ee72b054a4