[clang] [analyzer] Introduce per-entry-point statistics (PR #131175)

[Balazs Benics via cfe-commits]

================
@@ -688,6 +695,36 @@ AnalysisConsumer::getModeForDecl(Decl *D, AnalysisMode Mode) {
   return Mode;
 }
 
+template <typename DeclT>
+static clang::Decl *preferDefinitionImpl(clang::Decl *D) {
+  if (auto *X = dyn_cast<DeclT>(D))
+    if (auto *Def = X->getDefinition())
+      return Def;
+  return D;
+}
+
+template <> clang::Decl *preferDefinitionImpl<ObjCMethodDecl>(clang::Decl *D) {
+  if (const auto *X = dyn_cast<ObjCMethodDecl>(D)) {
+    for (auto *I : X->redecls())
+      if (I->hasBody())
+        return I;
+  }
+  return D;
+}
+
+static Decl *getDefinitionOrCanonicalDecl(Decl *D) {
+  assert(D);
+  D = D->getCanonicalDecl();
+  D = preferDefinitionImpl<VarDecl>(D);
+  D = preferDefinitionImpl<FunctionDecl>(D);
+  D = preferDefinitionImpl<TagDecl>(D);
+  D = preferDefinitionImpl<ObjCMethodDecl>(D);
+  assert(D);
+  return D;
+}
+
----------------
steakhal wrote:

```suggestion
```
I don't think this code is used upstream.

https://github.com/llvm/llvm-project/pull/131175