diff --git a/llvm/lib/CodeGen/MachineTraceMetrics.cpp b/llvm/lib/CodeGen/MachineTraceMetrics.cpp
index d8b3314..534733e 100644
--- a/llvm/lib/CodeGen/MachineTraceMetrics.cpp
+++ b/llvm/lib/CodeGen/MachineTraceMetrics.cpp
@@ -823,6 +823,14 @@
   updateDepth(BlockInfo[MBB->getNumber()], UseMI, RegUnits);
 }
 
+void MachineTraceMetrics::Ensemble::
+updateDepths(MachineBasicBlock::iterator Start,
+             MachineBasicBlock::iterator End,
+             SparseSet<LiveRegUnit> &RegUnits) {
+    for (; Start != End; Start++)
+      updateDepth(Start->getParent(), *Start, RegUnits);
+}
+
 /// Compute instruction depths for all instructions above or in MBB in its
 /// trace. This assumes that the trace through MBB has already been computed.
 void MachineTraceMetrics::Ensemble::