Instead of calling initOnce of dependencies, initialize metadata of dependencies in the same file.

Needs to pass aggregate_metadata option to protoc to trigger, e.g.:
--php_out=aggregate_metadata=foo#bar:generated_dir
For each input file, transitive dependencies (including itself), whose package name has the prefix of foo or bar, will be aggregated, in which their metadata string will be aggregated in the same internalAddGeneratedFile call. For other dependencies, initOnce is called as before.

This feature is EXPERIMENTAL. DO NOT USE!!!

Fix latest ArgumentException for C# extensions
Co-authored-by: Jan Tattermusch <jtattermusch@users.noreply.github.com>

Ref: https://bundler.io/blog/2019/05/14/solutions-for-cant-find-gem-bundler-with-executable-bundle.html

* Call register_class before getClass from desc

* Remove debug code

* Blacklist .proto source files is Bazel allows us to

This is a partial revert of https://github.com/protocolbuffers/protobuf/commit/7b28278c7d4f4175e70aef2f89d304696eb85ae3 to unblock, e.g., https://github.com/grpc/grpc/pull/21590 or https://github.com/lyft/envoy-mobile/issues/617 until Bazel is fixed.

Note: this is a forward-compatible change that automatically switches to the behavior intended by https://github.com/protocolbuffers/protobuf/commit/7b28278c7d4f4175e70aef2f89d304696eb85ae3 when a compatible Bazel is released without requiring users to upgrade Protobuf. We will revert this change when Bazel is fixed.

* Remove trailing ,

* Update BUILD

* add python38

* add python3.8

* fix tox

* Add scripts to test multirequest

* chmod ug+x multirequest.sh

* Add continuous test

* Compile c extension

* Class entry is obsolete in the second request
1) Needes to use class name in persistent map
2) Invalidate class entry stored in descriptor

* Add new files to dist

* Fix compile_extension

* Cleanup outputs for phpize

* Make c extension portable for php 7.4

* Fix conformance tests

* Fix comments

* Fix 32-bit

* Update conformance failure list

* Fix compiler warnings

* Cleanup configure created by phpize
The file created in php 7.4 is not recognizable by previous versions

* Fix conformance tests for 64-bit php

* Fix conformance test

* Fix compile warning

* Fix compile warnings

* Add a proto_lang_toolchain for javalite

* fix toolchain. Swap javalite example to master repo

* Initialize wrapper message during parsing
In case the internal value is default

* Fix zts build

* Add php 7.4 to docker image

* Use https links

* Implement lazy loading of php class for proto messages

* Fix php 7.1

* Fix encode

* Fix memory leak

* Fix enum descriptor

Revert "Make shared libraries be able to link to MSVC static runtime libraries, so that VC runtime is not required." (#6914)

This reverts commit 129a7c87. We are
seeing the following error when building Python release artifacts in Windows:
" error LNK2038: mismatch detected for 'RuntimeLibrary': value
'MD_DynamicRelease' doesn't match value 'MT_StaticRelease' in
descriptor.obj".

* Make reserve names map persistent

* Add DescriptorInternal to map

* Use get_msgdef_desc in encode_decode.c

* Add persistent map for ce=>def and enum=>def

* Replace get_ce_obj

* Remove get_proto_obj

* Remove obsolete fields from Descriptor and EnumDescriptor

* Add cache for descriptor php values

* Add cache for descriptors

* Fix bug

* Avoid add generated file again if it has been added

* Fix the bug upb depends on null-ended str for look up.

* Initialize generated pool impl

* Turn down old generated pool

* Add init entry flag protobuf.keep_descriptor_pool_after_request

By default, it's off. Add protobuf.keep_descriptor_pool_after_request=1 to php.ini to enable it

* Fix zts build

* Update Xcode version needed to run Kokoro tests

* Replace deprecated --no-ri --no-rdoc rubygem options with --no-document