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[llvm-exegesis] Fix pfm counter names for Haswell for older versions of libpfm

Authored by mstojanovic on Dec 19 2019, 3:52 AM.

Description

[llvm-exegesis] Fix pfm counter names for Haswell for older versions of libpfm

The inconsistency caused uops mode to fail on an older version of libpfm
since the dispatched_port was added as an alias for executed_port only
after v4.6.0 of libpfm.

Differential revision: https://reviews.llvm.org/D71665