Allow label one line above the associated instruction

[srid]

From https://opensourceforu.com/2011/08/gnusim8085-review/

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The label line needs to be assigned at least a line of code. For example, if you do something like the following:

mvi c, 0ah
mvi b, 05h
xra a
loop:
add b
dcr c
jnz loop

The above code would not assemble, as the line with the label “loop” does not have any code. Either you have to move the ADD B to the “loop:” label line, or simply include a NOP beside the label “loop”.

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It would be worthy supporting this syntax, as long as implementing it wouldn't break the semantics otherwise.