[llvm-exegesis] Let Counter returns up to 16 entries
LBR contains (up to) 16 entries for last x branches and the X86LBRCounter (from D77422) should be able to return all those. Currently, it just returns the latest entry, which could lead to mis-leading measurements. This patch aslo changes the LatencyBenchmarkRunner to accommodate multi-value readings. https://reviews.llvm.org/D81050
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