CVE-2020-0711: ChakraCore RCE Vulnerability

The vulnerability stems from improper scope management for functions declared in parameter lists. The commit diff shows critical modifications to: 1) Symbol binding logic (BindPidRefsInScope) to handle parameter-scope function declarations, 2) Function declaration flags (ParseFncDeclInternal) to track parameter-scope origins, and 3) Bytecode emission logic (StartEmitFunction) to handle merged scopes. These functions directly correlate with the CWE-787/CWE-119 descriptions of out-of-bounds writes and memory corruption through improper scope handling, as evidenced by the added test cases validating parameter-scope function behavior.