Fix some warnings on RuleContext

(Remove an unused field, and group method overloads together)

RELNOTES: None.
PiperOrigin-RevId: 209455639

src/main/java/com/google/devtools/build/lib/analysis/RuleContext.java

diff --git a/src/main/java/com/google/devtools/build/lib/analysis/RuleContext.java b/src/main/java/com/google/devtools/build/lib/analysis/RuleContext.java
index 7641833..65b7a9e 100644
--- a/src/main/java/com/google/devtools/build/lib/analysis/RuleContext.java
+++ b/src/main/java/com/google/devtools/build/lib/analysis/RuleContext.java
@@ -755,18 +755,6 @@
   }
 
   /**
-   * Returns the list of transitive info collections that feed into this target through the
-   * specified attribute. Note that you need to specify the correct mode for the attribute,
-   * otherwise an assertion will be raised.
-   */
-  public List<? extends TransitiveInfoCollection> getPrerequisites(String attributeName,
-      Mode mode) {
-    return Lists.transform(
-        getPrerequisiteConfiguredTargetAndTargets(attributeName, mode),
-        ConfiguredTargetAndData::getConfiguredTarget);
-  }
-
-  /**
    * Returns the prerequisites keyed by the CPU of their configurations. If the split transition
    * is not active (e.g. split() returned an empty list), the key is an empty Optional.
    */
@@ -959,6 +947,18 @@
   }
 
   /**
+   * Returns the list of transitive info collections that feed into this target through the
+   * specified attribute. Note that you need to specify the correct mode for the attribute,
+   * otherwise an assertion will be raised.
+   */
+  public List<? extends TransitiveInfoCollection> getPrerequisites(String attributeName,
+      Mode mode) {
+    return Lists.transform(
+        getPrerequisiteConfiguredTargetAndTargets(attributeName, mode),
+        ConfiguredTargetAndData::getConfiguredTarget);
+  }
+
+  /**
    * Returns all the providers of the specified type that are listed under the specified attribute
    * of this target in the BUILD file.
    */
@@ -1444,7 +1444,6 @@
     private ImmutableList<Aspect> aspects;
     private ToolchainContext toolchainContext;
     private ConstraintSemantics constraintSemantics;
-    private ConfiguredTargetAndData associatedTarget;
 
     @VisibleForTesting
     public Builder(