afdo_metadata: Publish new profiles for kernel 3.18.

Update chromeos-kernel-3_18 from R80-12607.47-1575888165 to R81-12739.4-1576492394

Change-Id: I04648948cb4d26bc6879e098e2c5b4b537323a2a
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/toolchain-utils/+/1972409
diff --git a/afdo_metadata/kernel_afdo.json b/afdo_metadata/kernel_afdo.json
index ec29222..fd8541b 100644
--- a/afdo_metadata/kernel_afdo.json
+++ b/afdo_metadata/kernel_afdo.json
@@ -6,6 +6,6 @@
         "name": "R81-12750.0-1576492613"
     }, 
     "chromeos-kernel-3_18": {
-        "name": "R80-12607.47-1575888165"
+        "name": "R81-12739.4-1576492394"
     }
 }
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