Merging r309323:

Merging r309323:
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r309323 | ab | 2017-07-27 14:27:25 -0700 (Thu, 27 Jul 2017) | 12 lines

[AArch64] Fix legality info passed to demanded bits for TBI opt.

The (seldom-used) TBI-aware optimization had a typo lying dormant since
it was first introduced, in r252573:  when asking for demanded bits, it
told TLI that it was running after legalize, where the opposite was
true.

This is an important piece of information, that the demanded bits
analysis uses to make assumptions about the node.  r301019 added such an
assumption, which was broken by the TBI combine.

Instead, pass the correct flags to TLO.
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_50@309586 91177308-0d34-0410-b5e6-96231b3b80d8