ARM: don't attempt to merge litpools referencing different PC-anchors.
Given something like:
ldr r0, .LCPI0_0 (== pc-rel var) add r0, pc ldr r1, .LCPI0_1 (== pc-rel var) add r1, pc
we cannot combine the 2 ldr instructions and litpools because they get added to
a different pc to form the correct address. I think the original logic came
from a time when we fused the LDRpci/PICADD instructions into one
pseudo-instruction so the PC was always immediately at-hand. That's no longer
Should fix general-dynamic TLS access on Linux, and quite possibly other -fPIC
code that relies on litpools (e.g. v6m and -Oz compilations) though trivial
tweaks of the .ll test didn't provoke anything.