Merge pull request #11748 from ctiller/c++compat5

.clang_complete

...filters/client_channel/resolver/dns/native/dns_resolver.c

...ters/client_channel/resolver/sockaddr/sockaddr_resolver.c

src/core/ext/filters/deadline/deadline_filter.c

src/core/ext/filters/max_age/max_age_filter.c

src/core/ext/filters/message_size/message_size_filter.c

...ilters/workarounds/workaround_cronet_compression_filter.c

src/core/ext/filters/workarounds/workaround_utils.c

src/core/lib/support/arena.c

src/core/lib/support/atm.c

src/core/lib/support/avl.c