[MERGE #2537 @jianchun] disable redeferral when -testtrace:stackfunc
[MERGE #2537 @jianchun] disable redeferral when -testtrace:stackfunc

Merge pull request #2537 from jianchun:utstackfunc

If redeferral happens, -testtrace:stackfunc may output more content and
cause unit test output mismatching baseline.

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