Commits on Nov 21, 2017

1. Support bitfield allocation units larger than 64 bits …

   Individual bitfields are still limited to at most 64 bits, but this
   restriction can be weakened when Rust supports u128.
   
   This implements issue #816.
   
   Usage notes:
   
   * Since common code is added to each generated binding, a program which uses
     more than one binding may need to work around the duplication by including
     each binding in its own module.
   * The values created by bitfield allocation unit constructors can be assigned
     directly to the corresponding struct fields with no need for transmutation.
   
   Implementation notes:
   
   __BindgenBitfieldUnit represents a bitfield allocation unit using a Storage
   type accessible as a slice of u8. The alignment of the unit is inherited from
   an Align type by virtue of the field:
   
   align: [Align; 0],
   
   The position of this field in the struct is irrelevant.
   
   The alignment of the Storage type is intended to be no larger than the
   alignment of the Align type, which will be true if the Storage type is, for
   example, an array of u8.
   
   Although the double underscore (__) prefix is reserved for implementations of
   C++, there are precedents for this convention elsewhere in bindgen and so the
   convention is adopted here too.
   
   Acknowledgement:
   
   Thanks to @fitzgen for an initial implementation of __BindgenBitfieldUnit and
   code to integrate it into bindgen.

   

   fitzgen authored and glyn committed Nov 21, 2017
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