[PATCH] [ARM] Wrong t2STMIA size optimization in Thumb2SizeReduction

[Sergey Dmitrouk]

Wrong check in Thumb2SizeReduction caused reduction of t2STMIA instruction
to t1STMIA even when t2STMIA has LR register in its register list.  This is
wrong as register list of t1STMIA is 8 bit long (for R0-R7 only), thus LR
register (R14) is just thrown away on emitting binary representation of t1STMIA.
It causes some data to be silently lost at run-time, in very rare cases.

http://reviews.llvm.org/D5290

Files:
  lib/Target/ARM/Thumb2SizeReduction.cpp
  test/CodeGen/ARM/wrong-t2stmia-size-opt.ll
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