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C++11 code cleanup.

PiperOrigin-RevId: 217364243

Remove all mention of TR1 tuple and our own implementation of tuple.

PiperOrigin-RevId: 216395043

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

Comments changes, no functionality changes

Formatting changes for automatic code management

This upstreams a Google-internal change (141765019).

This guards use of <type_traits> and its features with
GTEST_HAS_STD_TYPE_TRAITS_, and std::function with
GTEST_HAS_STD_FUNCTION_.

constructible return a default-constructed value by default.

Pull in gtest 696.

Reduced template instantiation depth for the AllOf and AnyOf matchers. Also some formatting changes.

adds support for SetArgPointee(L"wide string literal") -- by Vlad Losev.

Makes Google Mock compile much faster and use much less memory; reviewed by Nico Weber.  This fixes issue 68.

Picks up gtest r536; renames implicit_cast and down_cast to reduce the chance of clash (by Roman Perepelitsa); enables gmock_gen.py to handle storage specifiers (by Steve Fox).

Enables SetArgPointee<>() to accept a string literal; removes a self-assignment warning; teaches gmock doctor to diagnose TTB with Clang; picks up gtest r525.

Removes duplicated definition of SetArgumentPointee (by Vlad Losev); Makes gmock compilable on platforms that don't have ::abort() (by Acadeli Checa); Fixes compatibility with Symbian's STLport (by Acadeli Checa).