Drop x52 machine type

Author: farquet

ci/ci_common/bench-common.libsonnet

@@ -55,13 +55,6 @@
       threads_per_node:: if self.is_numa then self.num_threads / std.length(self.numa_nodes) else self.num_threads,
     },
 
-    x52:: common.linux_amd64 + self._bench_machine + {
-      machine_name:: "x52",
-      capabilities+: ["tmpfs25g"],
-      numa_nodes:: [0, 1],
-      default_numa_node:: 0,
-      num_threads:: 72
-    },
     e3:: common.linux_amd64 + self._bench_machine + {
       machine_name:: "e3",
       capabilities: ["e3", "tmpfs25g", "linux", "amd64"],