add global symbol table populate function

Author: varun-r-mallya

tests/failing_tests/undeclared_values.py

@@ -8,7 +8,7 @@
 @section("tracepoint/syscalls/sys_enter_execve")
 def sometag(ctx: c_void_p) -> c_int64:
     print("test")
-    print(f"{somevalue}")
+    print(f"{somevalue}")  #type: ignore
     return c_int64(1)
 
 @bpf