[MCSchedule] Remove comments about MinLatency. NFC

[flyingforyou]

Summary

There is no definition about MinLatency any more.

[mcrosier]

Looks like this should have been removed with r184032. LGTM.

[flyingforyou]

Thanks for review Chad.!

Committed in r263403.

include/llvm/MC/MCSchedule.h

struct MCSchedModel {
   // buffer for optimized loop execution. More generally, this represents the
   // optimal number of micro-ops in a loop body. A loop may be partially
   // unrolled to bring the count of micro-ops in the loop body closer to this
   // number.
   unsigned LoopMicroOpBufferSize;
   static const unsigned DefaultLoopMicroOpBufferSize = 0;
 
   // LoadLatency is the expected latency of load instructions.
-  //
-  // If MinLatency >= 0, this may be overriden for individual load opcodes by
-  // InstrItinerary OperandCycles.
   unsigned LoadLatency;
   static const unsigned DefaultLoadLatency = 4;
 
   // HighLatency is the expected latency of "very high latency" operations.
   // See TargetInstrInfo::isHighLatencyDef().
   // By default, this is set to an arbitrarily high number of cycles
   // likely to have some impact on scheduling heuristics.
-  // If MinLatency >= 0, this may be overriden by InstrItinData OperandCycles.
   unsigned HighLatency;
   static const unsigned DefaultHighLatency = 10;
 
   // MispredictPenalty is the typical number of extra cycles the processor
   // takes to recover from a branch misprediction.
   unsigned MispredictPenalty;
   static const unsigned DefaultMispredictPenalty = 10;