Make std::vector<bool> iterator operators friend inline

[François Dumont]

Here is the patch for _Bit_iterator and _Bit_const_iterator operators.

I noticed that _Bit_reference == and < operators could be made inline 
friend too. Do you want me to include this change in the patch ?


 Â Â Â  * include/bits/stl_bvector.h (_Bit_iterator_base::operator==): Replace
 Â Â Â  member method with inline friend.
 Â Â Â  (_Bit_iterator_base::operator<): Likewise.
 Â Â Â  (_Bit_iterator_base::operator!=): Likewise.
 Â Â Â  (_Bit_iterator_base::operator>): Likewise.
 Â Â Â  (_Bit_iterator_base::operator<=): Likewise.
 Â Â Â  (_Bit_iterator_base::operator>=): Likewise.
 Â Â Â  (operator-(const _Bit_iterator_base&, const _Bit_iterator_base&)): Make
 Â Â Â  inline friend.
 Â Â Â  (_Bit_iterator::operator+(difference_type)): Replace member method with
 Â Â Â  inline friend.
 Â Â Â  (_Bit_iterator::operator-(difference_type)): Likewise.
 Â Â Â  (operator+(ptrdiff_t, const _Bit_iterator&)): Make inline friend.
 Â Â Â  (_Bit_const_iterator::operator+(difference_type)): Replace member 
method
 Â Â Â  with inline friend.
 Â Â Â  (_Bit_const_iterator::operator-(difference_type)): Likewise.
 Â Â Â  (operator+(ptrdiff_t, const _Bit_const_iterator&)): Make inline
 Â Â Â  friend.

Tested under Linux x86_64.

Ok to commit ?

François

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