Testsuite: skip T10489 unless compiler_debugged (#10489)

testsuite/tests/typecheck/should_compile/T10489.hs

 module T10489 where
 
+-- Triggered an ASSERT in a debug build at some point.
 convert d = let d' = case d of '0' -> '!' in d'

testsuite/tests/typecheck/should_compile/all.T

@@ -444,6 +444,6 @@ test('T10177', normal, compile, [''])
 test('T10195', normal, compile, [''])
 test('T10109', normal, compile, [''])
 test('T10335', normal, compile, [''])
-test('T10489', normal, compile, [''])
+test('T10489', unless(compiler_debugged(), skip), compile, [''])
 test('T10564', normal, compile, [''])
 test('T10390', normal, compile, [''])