[CodeGen] Avoid potential sideeffects from XOR (#67193)
XOR may change flag values (e.g. for X86 gprs). In the case where that's not desirable, specify that buildClearRegister() should use MOV instead.
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XOR may change flag values (e.g. for X86 gprs). In the case where that's not desirable, specify that buildClearRegister() should use MOV instead.