fix: exclude decorators while adding asmop

[tohrnii]

Describe your changes

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• Repo forked and branch created from next according to naming convention.
• Commit messages and codestyle follow conventions.
• Relevant issues are linked in the PR description.
• Tests added for new functionality.
• Documentation/comments updated according to changes.

[bobbinth]

These parsers are getting replaced with the new parsing structure. The latest code for that structure is in #532. Could you check if the equivalent change needs to be made there?

[tohrnii]

@bobbinth I think the fix is already present in the new parser because of the following check:

// if the cycle count is 0, remove the decorator; otherwise update its cycle count
if cycle_count == 0 {
    self.decorators.remove(self.last_asmop_pos);
} else if let Decorator::AsmOp(assembly_op) = assembly_op {
    assembly_op.set_num_cycles(cycle_count as u8)
}

Maybe doc comment for the method can be updated to include decorators as well in the line:

/// If the cycle count is 0, the original decorator is removed from the list. This can happen
/// for instructions which do not contribute any operations to the span block - e.g., exec,
/// call, and syscall

Should I close this PR since these parsers are getting replaced?