tree 1b60a966b1566b9de38b40040c8deb90864670c8
parent c8d0f962563823c65ec92a5cf2350f103bfd9844
author Protobuf Team Bot <protobuf-github-bot@google.com> 1724173508 -0700
committer Copybara-Service <copybara-worker@google.com> 1724173745 -0700

Introduce `MessageCreator`, which will use more efficient techniques to instantiate objects if permitted by the compiler.
We can use memset for zero initialized objects, and memcpy for ones cloned from the prototype.
This permits creating objects from the parser without calling virtual functions.

For the cases where the efficient implementation can't be used, we generate a "placement new" style function to offload the memory allocation out of the code generation. This reduces code bloat even when we can't use the more efficient implementation.

Migrate many callers of `New` and similar to the new functionality. In particular, the parsing paths will use this.

Finally, make `New` non-virtual now that `MessageLite` can handle it directly. It reduces binary size.

PiperOrigin-RevId: 665411723