Bitwise operations on Bool are redundant with other logic operations
that stdlib already provides. The only reason to have them was to avoid
branching in the short-circuiting && and ||.
rdar://19340952
Surprisingly, replacing & and | in the standard library with && and ||
brought performance improvements and no significant performance
regressions:
RecursiveOwnedParameter 1.14
SelectionSort 1.19
Swift SVN r24674
