Subzero: Use std::vector<> instead of std::list for live range segments.

src/IceRegAlloc.cpp

Index: src/IceRegAlloc.cpp
diff --git a/src/IceRegAlloc.cpp b/src/IceRegAlloc.cpp
index 8a1656bb1f6c45983f9950c00eba425994d18dd0..bd4ca05a150966f32b0c285e34f5fbd78f484d93 100644
--- a/src/IceRegAlloc.cpp
+++ b/src/IceRegAlloc.cpp
@@ -268,9 +268,7 @@ void LinearScan::scan(const llvm::SmallBitVector &RegMaskFull) {
   VariablesMetadata *VMetadata = Func->getVMetadata();
 
   // Build a LiveRange representing the Kills list.
-  LiveRange KillsRange;
-  for (InstNumberT I : Kills)
-    KillsRange.addSegment(I, I);
+  LiveRange KillsRange(Kills);
   KillsRange.untrim();
 
   // RegUses[I] is the number of live ranges (variables) that register