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..d38836d2794e727770b878151759c94eeda8a96a 100644
--- a/src/IceRegAlloc.h
+++ b/src/IceRegAlloc.h
@@ -34,7 +34,8 @@ 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());