Revert "Revert "Upgrade to 5.0.71.48"" DO NOT MERGE

This reverts commit f2e3994fa5148cc3d9946666f0b0596290192b0e,
and updates the x64 makefile properly so it doesn't break that
build.

FPIIM-449

Change-Id: Ib83e35bfbae6af627451c926a9650ec57c045605
(cherry picked from commit 109988c7ccb6f3fd1a58574fa3dfb88beaef6632)
diff --git a/infra/config/cq.cfg b/infra/config/cq.cfg
index 6d36249..fbf090b 100644
--- a/infra/config/cq.cfg
+++ b/infra/config/cq.cfg
@@ -16,6 +16,7 @@
 verifiers {
   reviewer_lgtm {
     committer_list: "project-v8-committers"
+    dry_run_access_list: "project-v8-tryjob-access"
   }
 
   tree_status {
@@ -66,9 +67,9 @@
       }
     }
     buckets {
-      name: "tryserver.blink"
+      name: "tryserver.v8"
       builders {
-        name: "linux_blink_rel"
+        name: "v8_linux_blink_rel"
         experiment_percentage: 20
       }
     }