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.
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.