Added comment string to be written to auto gen files

llvm/projects/hpvm-tensor-rt/code_autogenerators/source_code_autogenerator.py

@@ -43,18 +43,19 @@ def generate_source_code(table, dir_name, filename, source_name):
         filename: Filename of original source
         source_name: Filename without the file extension (ex: foo/blah.cc --> blah)
     '''
+    file_comment = "// AUTO-GENERATED SOURCE CODE. REPLACED ALL INSTANCES OF %s WITH %s\n"
+
     source_file = open(filename, "r") 
     for knob_config in table:
         source_file.seek(0, 0)
        
-        new_file_contents = []
+        new_file_contents = [file_comment % (knob_config.orig_func_name, knob_config.new_func_call)]
 
         # Store complete line to handle cases where one line of code is split into two lines
         complete_line = ""
         for line in source_file:
             # Handles case where 1 actual line of code is split into 2 lines 
-            if len(line) >= 2 and not line.startswith("#") and \
-                        line.find(";") == -1: # Last char is always \n
+            if not line.startswith("#") and line.find(";") == -1: # Last char is always \n
                 complete_line += line
                 continue