ld: Add "-z separate-code" option to ELF linker

Code-only LOAD segment has the same requirement for segment alignment
and page sizes as GNU_RELRO segment.  But for GNU_RELRO segment, the
segment may not end at the same address of the end of data segment.  But
for code-only LOAD segment, it is exactly the same as code LOAD segment.

The new "-z separate-code" option will turn on both separate code read-only
data LOAD segments and GNU_RELRO segment.  The new "-z noseparate-code"
option will turn off only separate code and read-only data LOAD segments.
"-z relro" is updated not to turn off separate code and read-only data
LOAD segments.  "-z norelro" is updated to turn off both GNU_RELRO segment
as well as separate code and read-only data LOAD segments.

include/

	PR ld/22393
	* bfdlink.h (bfd_link_info): Change the relro field to 2 bits.

ld/

	PR ld/22393
	* NEWS: Mention "-z separate-code".
	* emultempl/elf32.em (gld${EMULATION_NAME}_get_script): Get
	builtin linker scripts and return linker scripts from disk for
	"-z separate-code".
	(gld${EMULATION_NAME}_handle_option): Set the first bit of
	link_info.relro for "-z relro".  Clear link_info.relro for
	"-z norelro".  Set link_info.relro to 2 for "-z separate-code".
	Keep only the first bit of link_info.relro for "notextonly".
	* genscripts.sh: Generate linker scripts for "-z separate-code".
	(LD_FLAG): Set to *textonly for "-z separate-code".
	* lexsup.c (elf_shlib_list_options): Update linker help messsages
	for "-z relro" and "-z norelro".  Add linker help messsages for
	"-z separate-code" and "-z noseparate-code".
	* ld.texinfo: Update "-z norelro".  Document "-z separate-code".

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