[clang][AST][NFC] Turn a isa<> + cast<> into dynamic_cast<>

Author: tbaederr

clang/lib/AST/ExprCXX.cpp

@@ -511,14 +511,14 @@ DependentScopeDeclRefExpr::CreateEmpty(const ASTContext &Context,
 }
 
 SourceLocation CXXConstructExpr::getBeginLoc() const {
-  if (isa<CXXTemporaryObjectExpr>(this))
-    return cast<CXXTemporaryObjectExpr>(this)->getBeginLoc();
+  if (const auto *TOE = dyn_cast<CXXTemporaryObjectExpr>(this))
+    return TOE->getBeginLoc();
   return getLocation();
 }
 
 SourceLocation CXXConstructExpr::getEndLoc() const {
-  if (isa<CXXTemporaryObjectExpr>(this))
-    return cast<CXXTemporaryObjectExpr>(this)->getEndLoc();
+  if (const auto *TOE = dyn_cast<CXXTemporaryObjectExpr>(this))
+    return TOE->getEndLoc();
 
   if (ParenOrBraceRange.isValid())
     return ParenOrBraceRange.getEnd();