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[PGO][PGSO] TargetLowering/TargetTransformationInfo/SwitchLoweringUtils part.

Authored by yamauchi on Oct 29 2019, 11:30 AM.

Description

[PGO][PGSO] TargetLowering/TargetTransformationInfo/SwitchLoweringUtils part.

Summary:
(Split of off D67120)

TargetLowering/TargetTransformationInfo/SwitchLoweringUtils changes for profile
guided size optimization.

Reviewers: davidxl

Subscribers: eraman, hiraditya, haicheng, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D69580