x86: Explicit displacement of 0 is considered the same as an implicit displacement of 0

[1superchip]

https://decomp.me/scratch/kGFk1

x86 has different encodings for instructions such as an implicit displacement of 0 and an explicit displacement of 0. Currently, objdiff is treating them as the same even though they are different sizes and encodings.

Not sure of an expected behavior to show the differences but objdump shows an offset of 0x0 for the explicit displacement and nothing (as objdiff is doing for both) for the implicit displacement of 0x0.

I have linked the scratch that uses objdiff on decomp.me but this issue does show up locally in objdiff.

[ifarbod]

I should point out that this issue is because of the assembly upload, but it's still a valid objdiff bug.