start throwing error on duplicate label

One less error that's only in the bootstrap phase.

On the other hand, for simplicity I got rid of the ability to override
the Entry label. One less special case, but we're also going further
from the ability to run subsets of layers. We haven't really been
exercising it for a long time, though (commit 7842, March 2021 when we
made baremetal the default).

1 files changed, 0 insertions, 0 deletions

diff --git a/linux/braces b/linux/braces
index 0930284c..bb79fe27 100755
--- a/linux/braces
+++ b/linux/braces
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