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[AArch64] Update Cortex-A55 SchedModel to improve LDP scheduling

Authored by NickGuy on Jul 12 2021, 2:36 AM.

Description

[AArch64] Update Cortex-A55 SchedModel to improve LDP scheduling

Specifying the latencies of specific LDP variants appears to improve
performance almost universally.

Differential Revision: https://reviews.llvm.org/D105882