[PATCH] Fix lazy setting for PLTREL overlap cpus.

[David Miller]

From: "Carlos O'Donell" <carlos@systemhalted.org>
Date: Wed, 4 Apr 2012 00:07:14 -0400

> If on sparc32/sparc64 you have *never* had overlap then stop defining
> ELF_MACHINE_PLTREL_OVERLAP at all and that's one less target to worry
> about and one more step closer to the eventual removal of this code.

I've always had overlap, and so does powerpc.  For us the JMPREL
always sits in last slots of the DT_REL(A).  For example:

davem@nunsaram:~/src$ readelf -d /lib/sparc-linux-gnu/libc.so.6
 ...
 0x00000002 (PLTRELSZ)                   204 (bytes)
 ...
 0x00000017 (JMPREL)                     0x203c0
 0x00000007 (RELA)                       0x1517c
 0x00000008 (RELASZ)                     45840 (bytes)
 ...

What I was saying is that I've never seen is the JMPREL being in the
_middle_ of DT_REL(A), ie. having non-JMPREL entries both before
and after the JMPREL ones.

Ie. (JMPREL + PLTRELSZ) == (RELA + RELASZ)

That's why I'm saying we don't need 3 ranges, but rather just 2.