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

[Jyoti Allur]

Hi Tim,
I have refactored the code. I did try the table driven approach to handle this, but since we have different diagnostics based SP, PC, LR and ITBlock, i had to check for those conditions anyway and the table was rendered as redundant and hence i removed it.

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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