PR22758, FAIL: Run pr22393-2

PR22758, FAIL: Run pr22393-2

We can't map different disk pages into the same memory page; The last
page mapped will simply overwrite any previous pages.  The
executable/non-executable new_segment test ignored this fact, leading
to a ld.so segfault on hppa when .dynamic is overwritten with zeros.

This patch moves existing tests for demand paging with lma on the same
memory page, to a new test performed before any case where we want a
new segment due to protection or loadable conflicts.

	PR 22758
	* elf.c (_bfd_elf_map_sections_to_segments): Don't start a new
	segment when demand paged with lma on the same page.  Test this
	before load/non-load, executable/non-executable,
	writable/non-writable tests and simplify.  Delete bogus relro
	condition in writable/non-writable test.  Delete outdated
	comment.  Formatting.