[release/6.0] Unify the FlushProcessWriteBuffers mechanism for macOS arm64 / x64#63301

jeffschwMSFT merged 1 commit intorelease/6.0dotnet/runtime:release/6.0from

backport/pr-62822-to-release/6.0dotnet/runtime:backport/pr-62822-to-release/6.0Copy head branch name to clipboard