[llvm] Remove unused constructor (NFC)

Closes #89193

Author: JOE1994

llvm/include/llvm/CodeGen/MachineScheduler.h

@@ -807,10 +807,6 @@ class ResourceSegments {
   // constructor for empty set
   explicit ResourceSegments(){};
   bool empty() const { return _Intervals.empty(); }
-  explicit ResourceSegments(std::list<IntervalTy> Intervals)
-      : _Intervals(Intervals) {
-    sortAndMerge();
-  }
 
   friend bool operator==(const ResourceSegments &c1,
                          const ResourceSegments &c2) {