Fix IPE test
A helper function was defined in a different module than used.
To reproduce: ./hadrian/build test --test-root-dirs=testsuite/tests/rts/ipe
Noticed by @blamario.
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A helper function was defined in a different module than used.
To reproduce: ./hadrian/build test --test-root-dirs=testsuite/tests/rts/ipe
Noticed by @blamario.