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[NFC][SLP] Add test case exposing SLP cost model bug. The bug is related to…

Authored by vdmitrie on May 28 2020, 8:54 AM.

Description

[NFC][SLP] Add test case exposing SLP cost model bug. The bug is related to aggregate build cost model adjustment that adds a bias to cost triggering vectorization of actually unprofitable to vectorize tree.

Differential Revision: https://reviews.llvm.org/D80682

Details