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[LTO] Store target attributes as vector of strings (NFC).

Authored by fhahn on Jan 23 2021, 4:09 AM.

Description

[LTO] Store target attributes as vector of strings (NFC).

The target features are obtained as a list of features/attributes.
Instead of storing them in a single string, store the vector. This
matches lto::Config's behavior and simplifies the transition to
lto::backend().

Reviewed By: tejohnson

Differential Revision: https://reviews.llvm.org/D95224