[1.6>master] Fix WAsmJs::ShouldJitFunction to give nojit flags precedence to -forcenative
[1.6>master] Fix WAsmJs::ShouldJitFunction to give nojit flags precedence to -forcenative

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