PATCH: Add range-for iteration adapter for Function::arg_begin/end

[Eli Bendersky]

Hello,

This patch is in similar vein to what done earlier to
Module::globals/aliases etc. I would really like to iterate over function
arguments like this in new code:

  for (Argument Arg : F.args()) {
    ...
  }

The question is: would it be OK to change existing code from explicit
iteration with the .args_begin/args_end idiom to this new idiom?

PTAL,
Eli
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