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Add -plugin-opt=sample-profile for thinLTO build.

Description

Add -plugin-opt=sample-profile for thinLTO build.

Summary: ThinLTO needs to pass down the sample profile file path to linker.

Reviewers: tejohnson, davidxl, mehdi_amini

Subscribers: bruno, cfe-commits

Differential Revision: https://reviews.llvm.org/D27832

Details