[HIPIFY][perl] Add "important" notice

# IMPORTANT: Do not change this file manually: it is generated by hipify-clang --perl


[ROCm/hip commit: 876af8f381]

projects/hip/hipify-clang/src/CUDA2HIP_Perl.cpp

@@ -60,6 +60,7 @@ namespace perl {
     "# THE SOFTWARE.\n"
     "##\n";
 
+  const string sImportant = "# IMPORTANT: Do not change this file manually: it is generated by hipify-clang --perl";
   const string tab = "    ";
   const string tab_2 = tab + tab;
   const string tab_3 = tab_2 + tab;
@@ -119,6 +120,7 @@ namespace perl {
   void generateHeader(unique_ptr<ostream>& streamPtr) {
     *streamPtr.get() << "#!/usr/bin/perl -w" << endl_2;
     *streamPtr.get() << sCopyright << endl;
+    *streamPtr.get() << sImportant << endl_2;
     *streamPtr.get() << "#usage " << hipify_perl << " [OPTIONS] INPUT_FILE" << endl_2;
     *streamPtr.get() << "use Getopt::Long;" << endl;
     *streamPtr.get() << my << "$whitelist = \"\";" << endl;