Duncan P. N. Exon Smith 83d3476fd2 CodeGen: Use references in MachineTraceMetrics::Trace, NFC ...

Pass non-null arguments by reference in MachineTraceMetrics::Trace,
simplifying future work to remove implicit iterator => pointer
conversions.

llvm-svn: 261509

2016-02-22 03:07:49 +00:00

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