[llvm] Revive constructor of 'ResourceSegments'

582c6a82b4bc2ac5cbff803960eeb022bff10168 removed a constructor of
'ResourceSegments' that is needed in LLVM unit tests.

* Revert 582c6a82b4bc2ac5cbff803960eeb022bff10168
* Update the constructor to take a const reference of
  `std::list` as pointed out in #89193.

1 files changed, 4 insertions, 0 deletions

diff --git a/llvm/include/llvm/CodeGen/MachineScheduler.h b/llvm/include/llvm/CodeGen/MachineScheduler.h
index 90d719e..b15abf0 100644
--- a/llvm/include/llvm/CodeGen/MachineScheduler.h
+++ b/llvm/include/llvm/CodeGen/MachineScheduler.h
@@ -807,6 +807,10 @@ public:
   // constructor for empty set
   explicit ResourceSegments(){};
   bool empty() const { return _Intervals.empty(); }
+  explicit ResourceSegments(const std::list<IntervalTy> &Intervals)
+      : _Intervals(Intervals) {
+    sortAndMerge();
+  }
 
   friend bool operator==(const ResourceSegments &c1,
                          const ResourceSegments &c2) {