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97c37bb4d4
Propagate the fix from r185712 to Thumb2 codegen as well. Original commit message applies here as well: A "pkhtb x, x, y asr #num" uses the lower 16 bits of "y asr #num" and packs them in the bottom half of "x". An arithmetic and logic shift are only equivalent in this context if the shift amount is 16. We would be shifting in ones into the bottom 16bits instead of zeros if "y" is negative. rdar://14338767 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185982 91177308-0d34-0410-b5e6-96231b3b80d8
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