add missing license headers

Author: SchrodingerZhu

libc/fuzzing/__support/hashtable_fuzz.cpp

@@ -1,3 +1,14 @@
+//===-- hashtable_fuzz.cpp ------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+///
+/// Fuzzing test for llvm-libc hashtable implementations.
+///
+//===----------------------------------------------------------------------===//
 #include "src/__support/CPP/new.h"
 #include "src/__support/CPP/optional.h"
 #include "src/__support/HashTable/table.h"

libc/fuzzing/__support/uint_fuzz.cpp

@@ -1,3 +1,14 @@
+//===-- uint_fuzz.cpp -----------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+///
+/// Fuzzing test for llvm-libc unsigned integer utilities.
+///
+//===----------------------------------------------------------------------===//
 #include "src/__support/CPP/bit.h"
 #include "src/__support/big_int.h"
 #include "src/string/memory_utils/inline_memcpy.h"