Only intern constants upon compilation entry

Before this commit the Prism compiler would try to intern constants
every time it re-entered. This pool of constants is "constant" (there is
only one pool per parser instance), so we should do it only once: upon
the top level entry to the compiler.

This change does just that: it populates the interned constants once.

Fixes: https://github.com/ruby/prism/issues/2152

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