[llvm] [IR] Add block number traits to CFG (PR #102758)

[Sergei Barannikov via llvm-commits]

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@@ -391,12 +423,24 @@ template <> struct GraphTraits<Inverse<Function*>> :
   static NodeRef getEntryNode(Inverse<Function *> G) {
     return &G.Graph->getEntryBlock();
   }
+
+  static unsigned getMaxNumber(Function *F) { return F->getMaxBlockNumber(); }
+  static unsigned getNumberEpoch(Function *F) {
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s-barannikov wrote:

Missing const here and in other declarations
```suggestion
  static unsigned getNumberEpoch(const Function *F) {
```

https://github.com/llvm/llvm-project/pull/102758