[CodeGen][MISched][NFC] Rename some instances of Cycle -> ReleaseAtCycle

This is to match the naming of arguments in MachineScheduler.h

Author: michaelmaitland

llvm/lib/CodeGen/MachineScheduler.cpp

@@ -4269,15 +4269,15 @@ static bool sortIntervals(const ResourceSegments::IntervalTy &A,
 }
 
 unsigned ResourceSegments::getFirstAvailableAt(
-    unsigned CurrCycle, unsigned AcquireAtCycle, unsigned Cycle,
+    unsigned CurrCycle, unsigned AcquireAtCycle, unsigned ReleaseAtCycle,
     std::function<ResourceSegments::IntervalTy(unsigned, unsigned, unsigned)>
         IntervalBuilder) const {
   assert(std::is_sorted(std::begin(_Intervals), std::end(_Intervals),
                         sortIntervals) &&
          "Cannot execute on an un-sorted set of intervals.");
   unsigned RetCycle = CurrCycle;
   ResourceSegments::IntervalTy NewInterval =
-      IntervalBuilder(RetCycle, AcquireAtCycle, Cycle);
+      IntervalBuilder(RetCycle, AcquireAtCycle, ReleaseAtCycle);
   for (auto &Interval : _Intervals) {
     if (!intersects(NewInterval, Interval))
       continue;
@@ -4287,7 +4287,7 @@ unsigned ResourceSegments::getFirstAvailableAt(
     assert(Interval.second > NewInterval.first &&
            "Invalid intervals configuration.");
     RetCycle += (unsigned)Interval.second - (unsigned)NewInterval.first;
-    NewInterval = IntervalBuilder(RetCycle, AcquireAtCycle, Cycle);
+    NewInterval = IntervalBuilder(RetCycle, AcquireAtCycle, ReleaseAtCycle);
   }
   return RetCycle;
 }