AMDGPU: Change boolean content type to 0 or 1
The usage of target boolean checks is overly inflexible, since sext and zext of a compare are equally cheap. The choice is arbitrary, but using 0/1 to some degree is the choice of lower resistance since that's what most targets use. This enables a few combines that don't bother to support ZeroOrNegativeOneBooleanContent.
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