[MERGE #744] Trivial CallFlags issue in jitted code
[MERGE #744] Trivial CallFlags issue in jitted code

Merge pull request #744 from pleath:errorctor
Fix an inconsistency between interpreter and JIT in the passing of call flags. Constructor calls with spread arguments were getting CallFlags_Value in jitted code but not interpreter, which exposed some weirdness in the Error constructor. (Suwei and/or Taylor are looking into that issue.)

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