Commits on Jun 18, 2017

1. Backport fixes to LLVM 4.0 ARM codegen bugs …

   So ARM had quite a few codegen bugs on LLVM 4.0 which are fixed on LLVM
   trunk. This backports 5 of them:
   r297871 - ARM: avoid clobbering register in v6 jump-table expansion.
       - fixes rust-lang#42248
   r294949 - [Thumb-1] TBB generation: spot redefinitions of index
   r295816 - [ARM] Fix constant islands pass.
   r300870 - [Thumb-1] Fix corner cases for compressed jump tables
   r302650 - [IfConversion] Add missing check in
   IfConversion/canFallThroughTo
       - unblocks rust-lang#39409

   

   arielb1 committed Jun 18, 2017
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