[StreamExecutor] Rename ::perftools::gputools -> ::stream_executor, part 1.

Step 1 of re-namespace'ing StreamExecutor into ::stream_executor.

This moves everything inside of stream_executor/..., and leaves a
namespace alias into ::perftools::gputools.  The next steps will clean
up users to use the new namespace.

This is mostly a mechanical change, but it also includes a bunch of
non-mechanical changes that ideally would be split out into separate
patches.  Unfortunately they all sort of need to be shoved in here for
various reasons:

 - forward declarations need to be in the same namespace as the actual
   types, so we need to change all forward declarations of
   StreamExecutor types in this one patch.

 - Uses of these forward declarations need to be changed to the new
   namespace (or otherwise we need to add a namespace alias to the
   relevant header, but this is pretty ugly).

 - Various initialization code needs to live in StreamExecutor's "real"
   namespace, so all this needs to be changed.

PiperOrigin-RevId: 193256128

1 files changed, 2 insertions, 4 deletions

diff --git a/tensorflow/stream_executor/device_description.h b/tensorflow/stream_executor/device_description.h
index fcf0928096..7f99d81ef3 100644
--- a/tensorflow/stream_executor/device_description.h
+++ b/tensorflow/stream_executor/device_description.h
@@ -27,8 +27,7 @@ limitations under the License.
 #include "tensorflow/stream_executor/launch_dim.h"
 #include "tensorflow/stream_executor/platform/port.h"
 
-namespace perftools {
-namespace gputools {
+namespace stream_executor {
 namespace internal {
 class DeviceDescriptionBuilder;
 }  // namespace internal
@@ -388,7 +387,6 @@ uint64 CalculateRegisterLimitForTargetOccupancy(
     const DeviceDescription &device_description, uint64 shared_memory_per_block,
     const ThreadDim &thread_dims, uint64 target_blocks_per_core);
 
-}  // namespace gputools
-}  // namespace perftools
+}  // namespace stream_executor
 
 #endif  // TENSORFLOW_STREAM_EXECUTOR_DEVICE_DESCRIPTION_H_