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Applied fixes for ClangTidy modernize-use-override and modernize-use-using.

PiperOrigin-RevId: 223800219

Internal Change

PiperOrigin-RevId: 222123106

Move the Matcher<T> interface to googletest so I can use it to extend death test regex matching in a subsequent change.

PiperOrigin-RevId: 221675910

Remove linked_ptr and use std::shared_ptr instead

PiperOrigin-RevId: 219129336

Remove linked_ptr and use std::shared_ptr instead

PiperOrigin-RevId: 218618184

Remove linked_ptr and use std::shared_ptr instead

PiperOrigin-RevId: 218571466

Now that googletest has moved to C++11, it should no longer
use NULL or 0 for the null pointer. This patch converts all
such usages to nullptr using clang-tidy.

This prevents LLVM from issuing -Wzero-as-null-pointer-constant
warnings.

PiperOrigin-RevId: 215814400

more comments changes

Comments changes, no functionality changes

Formatting changes,small cleanup,  no functionality changes

merging, 

...merging

RE-Doing the merge, this time with gcc on mac in the PR so I can catch errors before merging the PR

formatting

And also silence for MSVS14

preproc syntax ( I can never remember it)

syntax

cont.

continued

more mcvs fixing

merging gmock matchers 1

merges-2