Regalloc: Add operator >= to EvictionCost (llvm#160070)

Make the actual use context less ugly.

Author: arsenm

llvm/include/llvm/CodeGen/RegAllocEvictionAdvisor.h

@@ -91,6 +91,8 @@ struct EvictionCost {
     return std::tie(BrokenHints, MaxWeight) <
            std::tie(O.BrokenHints, O.MaxWeight);
   }
+
+  bool operator>=(const EvictionCost &O) const { return !(*this < O); }
 };
 
 /// Interface to the eviction advisor, which is responsible for making a

llvm/lib/CodeGen/RegAllocEvictionAdvisor.cpp

@@ -308,7 +308,7 @@ bool DefaultEvictionAdvisor::canEvictInterferenceBasedOnCost(
       Cost.BrokenHints += BreaksHint;
       Cost.MaxWeight = std::max(Cost.MaxWeight, Intf->weight());
       // Abort if this would be too expensive.
-      if (!(Cost < MaxCost))
+      if (Cost >= MaxCost)
         return false;
       if (Urgent)
         continue;