[perl #40991] [PATCH] PAST-pm: Unnecessary dummy 'root' rule in POST transformation

[Allison Randal]

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This patch removes the unnecessary dummy 'root' rule from PAST-pm's
PAST-to-POST transformation grammar, and from the 'compile' method in
PAST::Node. (All the 'root' transform did was call the 'post' transform
on the same node type.)

Allison