[MERGE #6061 @meg-gupta] Fix wasm slow test
[MERGE #6061 @meg-gupta] Fix wasm slow test

Merge pull request #6061 from meg-gupta:fixslow

There was a change in WasmSpec test harness back in Dec, the test was not updated accordingly.

Microsoft/ChakraCore,Microsoft/ChakraCore,Microsoft/ChakraCore,Microsoft/ChakraCore,Microsoft/ChakraCore,Microsoft/ChakraCore