Missing support for anonymous types

[ttreyer]

While extremely unlikely, a user program could have a function taking anonymous union/enum, as demonstrated by the function uprobeFunction3 in "tests/testprogs/uprobe_test.c":

int uprobeFunction3(
    enum { A, B, C } e,
    union {
      int a;
      char b;
    } u __attribute__((unused)))
{
  return e;
}

However, listing the arguments of the function with bpftrace -l 'uprobe:./testprogs/uprobe_test:uprobeFunction3' will not list the type of the arguments correctly.

What reproduces the bug? Provide code if possible.

Uncomment the "anonymous param type" in "tests/runtime/dwarf".