by default.

The compatibility macro `ABSL_LEGACY_THREAD_ANNOTATIONS` can be
defined on the compile command-line to temporarily restore these
spellings. All of the thread annotation macros are available under
ABSL_ prefixed spellings in `absl/base/thread_annotations.h`. The
compatibility macro and the legacy spellings will be removed in the
future.

See https://github.com/google/fuzztest/issues/41

PiperOrigin-RevId: 478498273
Change-Id: I120ad6480d031642bf95a11bf72ab883d9161810