[PATCH] [PATCH] [Thumb/Thumb2] Added restrictions on PC, LR, SP in the register list for PUSH/POP/LDM/STM

[Jyoti Allur]

Hi Tim,
It looks like I was too focused on special registers in register list violations, other diagnostic related with thumb mode alone somehow got overlooked by me. 

Updated the patch accordingly in the latest Diff.
Sorry for the trouble of having to review again.

http://reviews.llvm.org/D6090

Files:
  lib/Target/ARM/AsmParser/ARMAsmParser.cpp
  test/MC/ARM/thumb-diagnostics.s
  test/MC/ARM/thumb2-diagnostics.s
  test/MC/ARM/v8_IT_manual.s
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