[analyzer] [NFC] Fix minor formatting issues in RetainCountChecker

[NoQ]

I'd totally trust you to have this sort of stuff go in without review.

clang/lib/StaticAnalyzer/Checkers/RetainCountChecker/RetainCountChecker.h

public:
 
   RefVal releaseViaIvar() const {
     assert(getIvarAccessHistory() == IvarAccessHistory::AccessedDirectly);
     return RefVal(getKind(), getObjKind(), getCount(), getAutoreleaseCount(),
                   getType(), IvarAccessHistory::ReleasedAfterDirectAccess);
   }
 
   // Comparison, profiling, and pretty-printing.
-
   bool hasSameState(const RefVal &X) const {
     return getKind() == X.getKind() && Cnt == X.Cnt && ACnt == X.ACnt &&
            getIvarAccessHistory() == X.getIvarAccessHistory();
   }
 
   bool operator==(const RefVal& X) const {
     return T == X.T && hasSameState(X) && getObjKind() == X.getObjKind();
   }

clang/lib/StaticAnalyzer/Checkers/RetainCountChecker/RetainCountChecker.cpp

if (Summ.getArg(idx) == StopTrackingHard) {
       SVal V = CallOrMsg.getArgSVal(idx);
       if (SymbolRef Sym = V.getAsLocSymbol()) {
         state = removeRefBinding(state, Sym);
       }
     }
   }
 
   // Evaluate the effect on the message receiver.
-  const ObjCMethodCall *MsgInvocation = dyn_cast<ObjCMethodCall>(&CallOrMsg);
-  if (MsgInvocation) {
+  if (const auto *MsgInvocation = dyn_cast<ObjCMethodCall>(&CallOrMsg)) {
     if (SymbolRef Sym = MsgInvocation->getReceiverSVal().getAsLocSymbol()) {
       if (Summ.getReceiverEffect() == StopTrackingHard) {
         state = removeRefBinding(state, Sym);
       }
     }
   }
 
   // Consult the summary for the return value.
void RetainCountChecker::checkBind(SVal loc, SVal val, const Stmt *S,
   // A value escapes in three possible cases (this may change):
   //
   // (1) we are binding to something that is not a memory region.
   // (2) we are binding to a memregion that does not have stack storage
   // (3) we are binding to a memregion with stack storage that the store
   //     does not understand.
   ProgramStateRef state = C.getState();
 
-  if (Optional<loc::MemRegionVal> regionLoc = loc.getAs<loc::MemRegionVal>()) {
+  if (auto regionLoc = loc.getAs<loc::MemRegionVal>()) {
     escapes = !regionLoc->getRegion()->hasStackStorage();
 
     if (!escapes) {
       // To test (3), generate a new state with the binding added.  If it is
       // the same state, then it escapes (since the store cannot represent
       // the binding).
       // Do this only if we know that the store is not supposed to generate the
       // same state.
       SVal StoredVal = state->getSVal(regionLoc->getRegion());
       if (StoredVal != val)
         escapes = (state == (state->bindLoc(*regionLoc, val, C.getLocationContext())));
     }
     if (!escapes) {
       // Case 4: We do not currently model what happens when a symbol is
       // assigned to a struct field, so be conservative here and let the symbol
       // go. TODO: This could definitely be improved upon.
       escapes = !isa<VarRegion>(regionLoc->getRegion());
     }
   }
 
   // If we are storing the value into an auto function scope variable annotated
   // with (__attribute__((cleanup))), stop tracking the value to avoid leak
   // false positives.
-  if (const VarRegion *LVR = dyn_cast_or_null<VarRegion>(loc.getAsRegion())) {
+  if (const auto *LVR = dyn_cast_or_null<VarRegion>(loc.getAsRegion())) {
     const VarDecl *VD = LVR->getDecl();
     if (VD->hasAttr<CleanupAttr>()) {
       escapes = true;
     }
   }
 
   // If our store can represent the binding and we aren't storing to something
   // that doesn't have local storage then just return and have the simulation
   // state continue as is.
   if (!escapes)
       return;
 
   // Otherwise, find all symbols referenced by 'val' that we are tracking
   // and stop tracking them.
   state = state->scanReachableSymbols<StopTrackingCallback>(val).getState();
   C.addTransition(state);
 }
 
 ProgramStateRef RetainCountChecker::evalAssume(ProgramStateRef state,
-                                                   SVal Cond,
-                                                   bool Assumption) const {
   // FIXME: We may add to the interface of evalAssume the list of symbols
   //  whose assumptions have changed.  For now we just iterate through the
   //  bindings and check if any of the tracked symbols are NULL.  This isn't
   //  too bad since the number of symbols we will track in practice are
   //  probably small and evalAssume is only called at branches and a few
   //  other places.
   RefBindingsTy B = state->get<RefBindings>();
 
void RetainCountChecker::checkBeginFunction(CheckerContext &Ctx) const {
 
   for (unsigned idx = 0, e = FD->getNumParams(); idx != e; ++idx) {
     const ParmVarDecl *Param = FD->getParamDecl(idx);
     SymbolRef Sym = state->getSVal(state->getRegion(Param, LCtx)).getAsSymbol();
 
     QualType Ty = Param->getType();
     const ArgEffect *AE = CalleeSideArgEffects.lookup(idx);
     if (AE && *AE == DecRef && isISLObjectRef(Ty)) {
-      state = setRefBinding(state, Sym, RefVal::makeOwned(RetEffect::ObjKind::Generalized, Ty));
+      state = setRefBinding(
+          state, Sym, RefVal::makeOwned(RetEffect::ObjKind::Generalized, Ty));
     } else if (isISLObjectRef(Ty)) {
       state = setRefBinding(
           state, Sym,
           RefVal::makeNotOwned(RetEffect::ObjKind::Generalized, Ty));
     }
   }
 
   Ctx.addTransition(state);

clang/lib/StaticAnalyzer/Checkers/RetainCountChecker/RetainCountDiagnostics.cpp

else {
           os << "managed by Automatic Reference Counting";
         } else {
           os << "whose name ('" << MD->getSelector().getAsString()
              << "') does not start with "
                 "'copy', 'mutableCopy', 'alloc' or 'new'."
                 "  This violates the naming convention rules"
                 " given in the Memory Management Guide for Cocoa";
         }
-      }
-      else {
+      } else {
         const FunctionDecl *FD = cast<FunctionDecl>(D);
         os << "whose name ('" << *FD
            << "') does not contain 'Copy' or 'Create'.  This violates the naming"
               " convention rules given in the Memory Management Guide for Core"
               " Foundation";
       }
     }
   }