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Commit cedd4818 authored by Tim Northover's avatar Tim Northover
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ARM: Add Performance Monitor Extensions feature 

Performance monitors, including a basic cycle counter, are an official
extension in the ARMv7 specification. This adds support for enabling and
disabling them, orthogonally from CPU selection.

rdar://problem/13939186

llvm-svn: 182602
parent d4432394
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