whitelisting aix platform as it has sched_yield

Add caliper supported to java benchmark

Add tests to cover all the common special casing in the runtime code to
ensure things come out correctly.

Shard 64-bit Linux languages into different Kokoro jobs

Migrate Jenkins jobs to Kokoro

Add support for Windows ARM64 build

Calling Keychecker before checking key in MessageMap

resolved issue 4032 and added a unit test

Fixes #4060

Fix file permission for python package.

`umask 0022` makes sure the created package will be accessible by all users.

Java: generate an annotation to suppress deprecation warnings

Add deprecation annotation for oneof case.

The valueOf method on enums is deprecated, but for compatibility reasons
the generated code has to keep using it. We can use an annotation to
suppress the deprecation warnings.

* Add auto-generated header to C# generated files

* regenerate C# protos

 Avoid double underscores in macro name

Added our standard license header to structurally_valid.cc and its test

 Add unknown field support for csharp

Fixes https://github.com/google/protobuf/issues/3268