[PPC32] Support TLS GD/LE/IE/LE relocation types and their relaxations

[MaskRay]

Forgot to add ppc32-tls-gd.s

[ruiu]

LGTM

ELF/Arch/PPC.cpp

345 ↗

(On Diff #203291)

nit: you can remove {}.

361 ↗

(On Diff #203291)

ditto

[plotfi]

I am going to upload a fix to these tests. sed "s/# REQUIES: ppc/# REQUIRES: ppc/g"

Our internal bots fail with these.

[plotfi]

Tests fixed. Everything should be passing now.

[ruiu]

LGTM

lld/trunk/ELF/Arch/PPC.cpp

56

nit: it may be easier to read if you change this to

if (Config->IsLE)
  return read32(Loc);
else
  return read32(Loc - 2);

60

Ditto