[issue3944] faster long multiplication

[Mark Dickinson]

Mark Dickinson <dickinsm at gmail.com> added the comment:

Updated version of longobject_diff1:

 - add mul1 back in
 - rename MAX_PARTIALS to the more descriptive BLOCK_MUL_SIZE
 - rewrite digits_multiply so that the call to digits_multiply_add
   always has b_size=BLOCK_MUL_SIZE, then hard-code this and get
   rid of the b_size argument.  This should give the compiler some
   opportunities for loop-unrolling in digits_multiply_add.

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Added file: http://bugs.python.org/file13406/faster_long_mul.patch

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<http://bugs.python.org/issue3944>
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