tree e2aed336e7f9a1d033835cf6d8bcf4f2d8d23115
parent d2bd3c4717ed223bca1c68a87f243f4bcf492a4b
author Hans Boehm <hboehm@google.com> 1409093895 -0700
committer Hans Boehm <hboehm@google.com> 1409093895 -0700

Undefine _Atomic before redefining

Stdatomic.h was potentially redefining _Atomic, in spite of a
prior definition by <atomic>.  This could cause g++ builds that
included <stdatomic.h> with an available <atomic> header to break.

Change-Id: I562c7115118c0587d594d4d5b62d25101e47bfd8