message: Adding prefetch as a library to tf/core/platform/BUILD.
diff: @@ -139,6 +139,12 @@ cc_library(
  hdrs = ["platform.h"],
  )
  +cc_library(
  + name = "prefetch",
  + hdrs = ["prefetch.h"],
  + deps = [":platform"],
  +)
  +
  cc_library(
  name = "stacktrace",
  srcs = glob(["*/stacktrace.h"]),
  