Subzero: Optimize live range overlaps() computation through trimming.

src/IceRegAlloc.h

Index: src/IceRegAlloc.h
diff --git a/src/IceRegAlloc.h b/src/IceRegAlloc.h
index 99ed9084871b117c590993e540ae03ad613f1920..2dd9dac99303ba27987005e8d4991242e0f67cc3 100644
--- a/src/IceRegAlloc.h
+++ b/src/IceRegAlloc.h
@@ -34,10 +34,12 @@ public:
     return range().endsBefore(Other.range());
   }
   bool overlaps(const LiveRangeWrapper &Other) const {
-    return range().overlaps(Other.range());
+    const bool UseTrimmed = true;
+    return range().overlaps(Other.range(), UseTrimmed);
   }
   bool overlapsStart(const LiveRangeWrapper &Other) const {
-    return range().overlaps(Other.range().getStart());
+    const bool UseTrimmed = true;
+    return range().overlapsInst(Other.range().getStart(), UseTrimmed);
   }
   Variable *const Var;
   void dump(const Cfg *Func) const;