[clang-tools-extra] [clang-tidy] Rename out-of-line function definitions (PR #91954)

[Piotr Zegar via cfe-commits]

================
@@ -123,6 +123,9 @@ static const NamedDecl *getFailureForNamedDecl(const 
NamedDecl *ND) {
   if (const auto *Method = dyn_cast<CXXMethodDecl>(ND)) {
     if (const CXXMethodDecl *Overridden = getOverrideMethod(Method))
       Canonical = cast<NamedDecl>(Overridden->getCanonicalDecl());
+    else if (const FunctionTemplateDecl *Primary = 
Method->getPrimaryTemplate())
+      Canonical =
+          cast<NamedDecl>(Primary->getTemplatedDecl()->getCanonicalDecl());
----------------
PiotrZSL wrote:

It's fine, but would be really nice to check if result of getTemplatedDecl 
isn't nullptr (just in case).

https://github.com/llvm/llvm-project/pull/91954
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