[PATCH] ARMLoadStoreOptimizer: Fix errata 602117 handling and make testcase actually test for it

[Matthias Braun]

Hi rengolin, jmolloy, mroth, charlieturner7c5,

Also do a bit of code cleanup in FixInvalidRegPairOp() by breaking out of the function earlier.


This fixes PR23912

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D10620

Files:
  lib/Target/ARM/ARMLoadStoreOptimizer.cpp
  test/CodeGen/ARM/ldrd.ll
  test/CodeGen/Thumb2/float-ops.ll

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