- Sort of lie and say that %eax is an output only and not an input for the

  non-386 atomic_load_acq().  %eax is an input since its value is used in
  the cmpxchg instruction, but we don't care what value it is, so setting
  it to a specific value is just wasteful.  Thus, it is being used without
  being initialized as the warning stated, but it is ok for it to be used
  because its value isn't important.  Thus, we are only sort of lying when
  we say it is an output only operand.
- Add "cc" to the clobber list for atomic_load_acq() since the cmpxchgl
  changes ZF.

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