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Implement Replace::Replace properly for aarch64 #110

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Implement Replace::Replace properly for aarch64 #110

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Commits on Jun 20, 2020

  1. Implement Replace::Replace properly for aarch64 

    Add a separate implementation for aarch64 which boils down to

    ldr x17, =0x1122334455667788
    br x17

The `x17` register is used as it's allowed to be modified during
function call and doesn't require saving. Old approach under `SOME_ARM`
ifdef that doesn't require changing any registers isn't possible since
the `pc` register is no longer directly accessible.

Tested with qemu-aarch64 user mode emulation.
    @mikedld
    mikedld committed Jun 20, 2020
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