Wasm testsuite failure: hpc tests

The hpc compile/run way in the testsuite works for the wasm backend, so it seems the code instrumentation logic doesn't break the wasm backend, and the hpc-related logic in RTS doesn't cause harm at runtime. However, there are a few tests that involve comparing hpc output, and those test cases are failing for the wasm backend at the moment. It's likely that more work is needed to get hpc actually working for the wasm backend, so opening this ticket to track this issue.