[MERGE #3891 @sigatrev] ARM64: ensure CMP and TST are legalized
[MERGE #3891 @sigatrev] ARM64: ensure CMP and TST are legalized

Merge pull request #3891 from sigatrev:arm64-legalizeCMP

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