[PATCH] Improve big-endian support for ARM and AArch64

[Charlie Turner]

Please find the updated patches attached.

Patch 1 now contains only the refactoring and a test.
Patch 2 contains the updates to the ARM and AArch64 relocation visitor & associated tests
Patch 3 contains the user interface change which reports the detected endianness & associated tests. 

Thanks,
Charlie.
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