[llvm] [CodeLayout] Size-aware machine block placement (PR #109711)

[Ellis Hoag via llvm-commits]

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@@ -3604,24 +3624,48 @@ void MachineBlockPlacement::applyExtTsp() {
     // not see a perf improvement with the exact block sizes.
     auto NonDbgInsts =
         instructionsWithoutDebug(MBB.instr_begin(), MBB.instr_end());
-    int NumInsts = std::distance(NonDbgInsts.begin(), NonDbgInsts.end());
+    size_t NumInsts = std::distance(NonDbgInsts.begin(), NonDbgInsts.end());
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ellishg wrote:

I'm not completely sure if this works, but it's worth a try.
```suggestion
    size_t NumInsts = llvm::size(NonDbgInsts);
```

https://github.com/llvm/llvm-project/pull/109711