Eli Bendersky cf2de5a970 Add args() iteartor adapter to Function, for range-for loops.
This patch is in similar vein to what done earlier to Module::globals/aliases
etc. It allows to iterate over function arguments like this:

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



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@204835 91177308-0d34-0410-b5e6-96231b3b80d8
2014-03-26 18:04:27 +00:00
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