[MERGE #5162 @pleath] [MSFT 16727746] Do not leave a null slot in the frame display when generating code for an eval
[MERGE #5162 @pleath] [MSFT 16727746] Do not leave a null slot in the frame display when generating code for an eval

Merge pull request #5162 from pleath:16727746

Load/store of undeclared properties will traverse the entire frame display, including this slot.

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