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[LV] Interleaved access vectorization: fix computing new alias info

Authored by anemet on Dec 6 2017, 2:42 PM.

Description

[LV] Interleaved access vectorization: fix computing new alias info

As a new access is generated spanning across multiple fields, we need to
propagate alias info from all the fields to form the most generic alias info.

rdar://35602528

Differential Revision: https://reviews.llvm.org/D40617

llvm-svn: 319979