[clang] Remove extra ';' in MultiplexExternalSemaSource.cpp (NFC)

/llvm-project/clang/lib/Sema/MultiplexExternalSemaSource.cpp:317:2:
error: extra ';' outside of a function is incompatible with C++98 [-Werror,-Wc++98-compat-extra-semi]
};
 ^
1 error generated.

Author: DamonFool

clang/lib/Sema/MultiplexExternalSemaSource.cpp

@@ -314,7 +314,7 @@ void MultiplexExternalSemaSource::ReadPendingInstantiationsOfConstexprEntity(
     const NamedDecl *D, llvm::SmallSetVector<NamedDecl *, 4> &Decls) {
   for (size_t i = 0; i < Sources.size(); ++i)
     Sources[i]->ReadPendingInstantiationsOfConstexprEntity(D, Decls);
-};
+}
 
 void MultiplexExternalSemaSource::ReadLateParsedTemplates(
     llvm::MapVector<const FunctionDecl *, std::unique_ptr<LateParsedTemplate>>