[erlang-patches] Fix for bsr bug with huge numbers

[Lars Hesel Christensen]

Thus pull request fixes a bug in the bsr function, which manifests when a
huge number is shifted a huge number of bits to the right. It simply
returns the number unshifted:

1> 1183140560213014108063589658350 bsr
146783911423364576743092537299333564210980159306769991919205685720763064069663027716481187399048043939495935.
1183140560213014108063589658350

The commit messages contain more information.

The pull request is here:

https://github.com/erlang/otp/pull/86

This bug was brought to my attention by Kresten Krab Thorup.

Best regards,
Lars Hesel Christensen
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