[Ironruby-core] Code Review: Methods6

[Tomas Matousek]

tfpt review "/shelveset:Methods6;REDMOND\tomat"
Comment  :
  Fixes bugs:
  -     method aliasing - aliased method has its own method attributes,
  -     module_function, private, public, protected: the attributes were not set to the "right" scopes,
  -     module_function - defined only singleton method, not private instance one,
  -     __FILE__ in eval,
  -     super call in a block in top-level code was broken,
  -     ParseTree distinguishes aliased methods and methods defined via define_method (partially supported, to be finished).
  -     ParseTree lacked implementation of ArrayItemAccess node in read context,
  -     method_defined? didn't filter out private methods.
  -     [ ironruby-Bugs-22605 ] TrueClass and FalseClass should be able to be reopened

  Adds raw implementation of Iconv library.
  Adds GC module.
  Adds Kernel#warn and Kernel#type methods.

  A bit of refactoring - groups methods in RubyUtils.
  Includes ArrayOfT shelveset, which implements "of" method for System::Array.

Tomas
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