[MERGE #4871 @Cellule] Legalizer assert messages details
[MERGE #4871 @Cellule] Legalizer assert messages details

Merge pull request #4871 from Cellule:legal_assert_msg

Use more specific assert message for legalization for better bug grouping.

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