X86: Fix register ordering. The correct order is unintuitively rax, rcx, rdx, rbx, etc, not rax, rbx, rcx, rdx.
X86: Fix register ordering.
The correct order is unintuitively rax, rcx, rdx, rbx, etc, not rax, rbx, rcx, rdx.

andrewfu0325/gem5-aladdin,andrewfu0325/gem5-aladdin,andrewfu0325/gem5-aladdin,andrewfu0325/gem5-aladdin,andrewfu0325/gem5-aladdin,andrewfu0325/gem5-aladdin,andrewfu0325/gem5-aladdin