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Commit 6f5ee7a3 authored by Jan Beulich's avatar Jan Beulich
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gas: invoke md_optimize_expr() also for unary expressions

Give backends a chance to see these, just as they can see binary ones.
Most of those which use this hook already cope with NULL being passed
for the left operand (typically because of checking the operator first).
Adjust the two which don't.

Take the opportunity and also document the hook.
parent 762acf21
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