[llvm] [ctx_prof] CtxProfAnalysis: populate module data (PR #102930)

[Snehasish Kumar via llvm-commits]

================
@@ -35,6 +51,20 @@ class PGOContextualProfile {
     return *Profiles;
   }
 
+  bool isFunctionKnown(const Function &F) const {
+    return getDefinedFunctionGUID(F) != 0;
+  }
+
+  uint32_t allocateNextCounterIndex(const Function &F) {
+    assert(isFunctionKnown(F));
+    return FuncInfo.find(getDefinedFunctionGUID(F))->second.NextCounterIndex++;
----------------
snehasish wrote:

Is this performing the lookup 2x on an assert build? If so maybe rewrite this as 
```
auto& [found, iter] = FuncInfo.find(....);
(void) found;
assert(found && "function not found");
```

https://github.com/llvm/llvm-project/pull/102930