[llvm] [MISched] Add statistics to quantify scheduling (PR #138090)

[Cullen Rhodes via llvm-commits]

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@@ -3503,6 +3511,9 @@ void GenericScheduler::initPolicy(MachineBasicBlock::iterator Begin,
     RegionPolicy.OnlyBottomUp = false;
     RegionPolicy.OnlyTopDown = false;
   }
+
+  this->BotIdx = NumRegionInstrs - 1;
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c-rhodes wrote:

there is for `NumRegionInstrs` but not `BotIdx`, removed thanks 👍 

https://github.com/llvm/llvm-project/pull/138090