Update ops-related pbtxt files.

PiperOrigin-RevId: 340262660
Change-Id: I0ca63e5b5e19ab16377c06ffd8ea41379705e27b

tensorflow/core/ops/compat/ops_history_v2/AsString.pbtxt

@@ -184,3 +184,67 @@ op {
     }
   }
 }
+op {
+  name: "AsString"
+  input_arg {
+    name: "input"
+    type_attr: "T"
+  }
+  output_arg {
+    name: "output"
+    type: DT_STRING
+  }
+  attr {
+    name: "T"
+    type: "type"
+    allowed_values {
+      list {
+        type: DT_INT8
+        type: DT_INT16
+        type: DT_INT32
+        type: DT_INT64
+        type: DT_COMPLEX64
+        type: DT_COMPLEX128
+        type: DT_FLOAT
+        type: DT_DOUBLE
+        type: DT_BOOL
+        type: DT_VARIANT
+      }
+    }
+  }
+  attr {
+    name: "precision"
+    type: "int"
+    default_value {
+      i: -1
+    }
+  }
+  attr {
+    name: "scientific"
+    type: "bool"
+    default_value {
+      b: false
+    }
+  }
+  attr {
+    name: "shortest"
+    type: "bool"
+    default_value {
+      b: false
+    }
+  }
+  attr {
+    name: "width"
+    type: "int"
+    default_value {
+      i: -1
+    }
+  }
+  attr {
+    name: "fill"
+    type: "string"
+    default_value {
+      s: ""
+    }
+  }
+}

tensorflow/core/ops/ops.pbtxt

@@ -2278,6 +2278,7 @@ op {
         type: DT_FLOAT
         type: DT_DOUBLE
         type: DT_BOOL
+        type: DT_VARIANT
       }
     }
   }