[clang] [analyzer][NFC] Introduce framework for checker families (PR #139256)

[Donát Nagy via cfe-commits]

================
@@ -56,11 +54,11 @@ static const Expr *getDenomExpr(const ExplodedNode *N) {
 
 void DivZeroChecker::reportBug(StringRef Msg, ProgramStateRef StateZero,
                                CheckerContext &C) const {
-  if (!isPartEnabled(DivideZeroChecker))
+  if (!DivideZeroChecker.isEnabled())
     return;
   if (ExplodedNode *N = C.generateErrorNode(StateZero)) {
-    auto R = std::make_unique<PathSensitiveBugReport>(
-        BugTypes[DivideZeroChecker], Msg, N);
+    auto R = std::make_unique<PathSensitiveBugReport>(DivideZeroChecker.getBT(),
+                                                      Msg, N);
----------------
NagyDonat wrote:

I felt that this implicit conversion would be a bit "too magical", but it would be _very_ easy to declare that `CheckerFrontendWithBugType` derives from both `CheckerFrontend` and `BugType`, and I'm not opposed if you prefer it.

https://github.com/llvm/llvm-project/pull/139256