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Treat default-constructed string_view same as constructed from "".
In the context of string comparison (e.g. HasSubstr, StartsWith, EndsWith,
etc.), a default-constructed string_view (nullptr) should be semantically same
as a empty string "".

PiperOrigin-RevId: 212816839

This makes ResultOf more convenient to use. In particular, the matcher now accepts
lambdas.

PiperOrigin-RevId: 210118509

Comments changes, no functionality changes

code merge

code sync

Code sync

Fixes issue #1554. This is internal cl/195020996.

merging, 

testing

more typos

typo

typo

typo

http://cl/193386206

merge, explicit, ( should be it)

http://cl/193060888

http://cl/193060888

msvc

revert this one

merge, ... gmock-matchers test

Merging matchers test

More on MSVC warning C4503, decorated name length exceeded

Fixing build break on MSVC

merging gmock matchers 1