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[ResetMachineFunctionPass] Add visited functions statistics info

Authored by craig.topper on Mar 13 2019, 6:13 PM.

Description

[ResetMachineFunctionPass] Add visited functions statistics info

Adding a "NumFunctionsVisited" for collecting the visited function number.
It can be used to collect function pass rate in some tests,
the pass rate = (NumberVisited - NumberReset)/NumberVisited.
e.g. it can be used for caculating GlobalISel pass rate in Test-Suite.

Patch by Tianyang Zhu (zhutianyang)

Differential Revision: https://reviews.llvm.org/D59285

llvm-svn: 356114