[PATCH] Fix ARM's add->adr translations for expressions

[Joerg Sonnenberger]

Hi t.p.northover, grosbach,

When transforming non-immediates from the PC-argument form of add to adr, PC needs to get added as expression base. At the same time, the magic offset 8 has to be specified too, otherwise the computed immediate is off.

http://reviews.llvm.org/D6354

Files:
  lib/Target/ARM/AsmParser/ARMAsmParser.cpp
  test/MC/ARM/basic-arm-instructions.s
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