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[LLD][ELF] - Simplify Call-Chain Clustering implementation a bit.

Description

[LLD][ELF] - Simplify Call-Chain Clustering implementation a bit.

Looking at the current implementation and algorithm description,
it does not seem we need to keep vector with all edges for
each cluster and can just remember the best one. This is NFC change.

Differential revision: https://reviews.llvm.org/D50609