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Fix unused function warning on Mac OS.

Both names must be valid C++ identifiers, and they should not contain underscore (`_`)

merges

As of recently, Google Test fails to compile with the warning below when
used in projects with strict warning settings.

googletest/src/gtest-death-test.cc:1004:13: error: unused function 'StackGrowsDown' [-Werror,-Wunused-function]

Fix std::iscntrl use in gtest-printers.cc

cleanup, merges

cleanup, merges

merging, cleaning up

merges

merges

 moving JoinAsTuple to internal

ContainsUnprintableControlCodes() in gtest-printers.cc passes a char
argument to std::iscntrl. Although its argument is an int, std::iscntrl
produces undefined behavior if its argument is not representable as an
unsigned char. The standard library on Windows asserts that the argument
is an unsigned char, resulting in an assertion crash on debug builds.

merges

merges

merges

Add ability to throw from ASSERT