Rename tests so that they have a unique name.

testsuite/tests/typecheck/should_run/all.T

@@ -116,5 +116,5 @@ test('T8739', normal, compile_and_run, [''])
 test('T9497a-run', [exit_code(1)], compile_and_run, ['-fdefer-typed-holes'])
 test('T9497b-run', [exit_code(1)], compile_and_run, ['-fdefer-typed-holes -fno-warn-typed-holes'])
 test('T9497c-run', [exit_code(1)], compile_and_run, ['-fdefer-type-errors -fno-warn-typed-holes'])
-test('T9858b', normal, compile_and_run, [''])
 test('T9858c', normal, compile_and_run, [''])
+test('T9858d', normal, compile_and_run, [''])