David Green 351edf1c47 [ARM] Remove FeaturePerfMon from armv7-m ...

FeaturePerfMon relates to the PMU extensions available in armv7-a, and
should not be available in v7-m (it requires loading from a system
register with a mrc). Sink it down a level in the dependency map so that
it isn't present in ARMv7m or HasV8MMainlineOps.

It is also removed from the Neoverse-N2, as it will already be
transitively included.

Differential Revision: https://reviews.llvm.org/D117022

2022-01-12 09:44:53 +00:00

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