Use an offset-pointer for some hash tables in FileDescriptorTables.

All the object live in their FlatAlloc, so they are guaranteed to be "close" to
the base pointer of the allocation.

This reduces their memory cost in half in 64-bit builds.

PiperOrigin-RevId: 914476807

Samuel Benzaquen committed 1mo ago

3ca8fc4e10cbacd5671bfaad7470266b49342a7d

Parent: 345df76

Committed by Copybara-Service <copybara-worker@google.com> on 5/12/2026, 9:28:27 PM