elf: Assume disjointed .rela.dyn and .rela.plt for loader

The patch removes the the ELF_DURING_STARTUP optimization and assume
both .rel.dyn and .rel.plt might not be subsequent.  This allows some
code simplification since relocation will be handled independently
where it is done on bootstrap.

At least on x86_64_64, I can not measure any performance implications.
Running 10000 time the command

  LD_DEBUG=statistics ./elf/ld.so ./libc.so

And filtering the "total startup time in dynamic loader" result,
the geometric mean is:

                  patched       master
  Ryzen 7 5900x     24140        24952
  i7-4510U          45957        45982

(The results do show some variation, I did not make any statistical
analysis).

It also allows build arm with lld, since it inserts ".ARM.exidx"
between ".rel.dyn" and ".rel.plt" for the loader.

Checked on x86_64-linux-gnu and arm-linux-gnueabihf.

Reviewed-by: H.J. Lu <hjl.tools@gmail.com>