fixup! Add test T17747

testsuite/tests/rts/all.T

@@ -528,7 +528,13 @@ test('T17088',
      compile_and_run, ['-rtsopts -O2'])
 
 test('T15427', js_broken(22374), compile_and_run, [''])
-test('T17747', [], makefile_test, ['T17747'])
+test('T17747',
+     [# This test tries to allocate virtual memory outside of the managed heap.
+      # The required primops are not available on the following platforms:
+      when(arch('javascript'), expect_fail),
+      when(arch('wasm32'), expect_fail)],
+     makefile_test,
+     ['T17747'])
 
 test('T19481',
      [extra_run_opts('+RTS -T -RTS'),