Restore Syzygy binaries in DEPS.

DEPS

Index: DEPS
diff --git a/DEPS b/DEPS
index db0aeefa25c2babdadff953621424babcdade331..6edcdb99fa2fbc6d194e564a4c1e958170d0ea9e 100644
--- a/DEPS
+++ b/DEPS
@@ -493,6 +493,17 @@ hooks = [
                 '-d', 'src/tools/luci-go/linux64',
     ],
   },
+  # Pull the Syzygy binaries, used for optimization and instrumentation.
+  {
+    'name': 'syzygy-binaries',
+    'pattern': '.',
+    'action': ['python',
+               'src/build/get_syzygy_binaries.py',
+               '--output-dir=src/third_party/syzygy/binaries',
+               '--revision=a8456d9248a126881dcfb8707ca7dcdae56e1ac7',
+               '--overwrite',
+    ],
+  },
   {
     # Pull sanitizer-instrumented third-party libraries if requested via
     # GYP_DEFINES.