[1.4>master] [MERGE #2242 @meg-gupta] Fix for legacy test asserts
[1.4>master] [MERGE #2242 @meg-gupta] Fix for legacy test asserts

Merge pull request #2242 from meg-gupta:fixlegacy

Addresses that fit in 32-bit can get constant folded into opeq instruction
with TyVar type. Handle this in the DBCheckPostLower asserts.

Fixes #2238

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