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[LAA] Support pointer phis in loop by analyzing each incoming pointer.

Authored by fhahn on Apr 28 2021, 12:02 PM.

Description

[LAA] Support pointer phis in loop by analyzing each incoming pointer.

SCEV does not look through non-header PHIs inside the loop. Such phis
can be analyzed by adding separate accesses for each incoming pointer
value.

This results in 2 more loops vectorized in SPEC2000/186.crafty and
avoids regressions when sinking instructions before vectorizing.

Reviewed By: Meinersbur

Differential Revision: https://reviews.llvm.org/D101286