Commits on Jun 2, 2021

1. Fix warnings raised by clang 11 …

   This fixes a few kinds of warnings:
    - inconsistent-missing-override when the overriding site is missing the
      override keyword
    - unused-function when a function is neither visible nor used
    - unused-private-field when a private field exists but is never used
    - sign-compare when unsigned ints are compared to signed ints. Not all
      of those have been addressed, but this warning isn't enabled by
      default.
   
   This fixes protocolbuffers#8612.

   

   Kernald committed Jun 2, 2021
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