[ast matcher] add ExportDecl in dynamically matchers (#118258)

Author: HerrCai0907

clang/lib/ASTMatchers/Dynamic/Registry.cpp

@@ -243,6 +243,7 @@ RegistryMaps::RegistryMaps() {
   REGISTER_MATCHER(equalsBoundNode);
   REGISTER_MATCHER(equalsIntegralValue);
   REGISTER_MATCHER(explicitCastExpr);
+  REGISTER_MATCHER(exportDecl);
   REGISTER_MATCHER(expr);
   REGISTER_MATCHER(exprWithCleanups);
   REGISTER_MATCHER(fieldDecl);