CODE_LABEL vs LABEL_REF

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To: gcc-help <gcc-help@xxxxxxxxxxx>
Subject: CODE_LABEL vs LABEL_REF
From: William Tambe <tambewilliam@xxxxxxxxx>
Date: Fri, 5 Apr 2019 16:46:39 -0500

What is the difference between CODE_LABEL and LABEL_REF ?

I have only been seeing constraints matching LABEL_REF; does it make
sense to have a constraint matching CODE_LABEL ?

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