Crypto: Improve checked add functions & add tests#8501

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DaGenix wants to merge 2 commits intorust-lang:masterfrom

DaGenix:improve-checked-add-functions

Commits on Aug 16, 2013

Crypto: update checked addition functions to use CheckedAdd intrinsic.
Palmer Cox
committed
Crypto: Add tests for add_bytes_to_bits functions.
Palmer Cox
committed