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[LoopReroll] Fix reroll root legality checking.

Description

[LoopReroll] Fix reroll root legality checking.

The code checked that the first root was an appropriate distance from
the base value, but skipped checking the other roots. This could lead to
rerolling a loop that can't be legally rerolled (at least, not without
rewriting the loop in a non-trivial way).

Differential Revision: https://reviews.llvm.org/D56812

Details

Committed
efriedmaFeb 11 2019, 4:33 PM
Differential Revision
D56812: [LoopReroll] Fix reroll root legality checking.
Parents
rL353778: Define _ENABLE_EXTENDED_ALIGNED_STORAGE on Windows.
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