Minor, add comments on declarations used in Eclipse plugin

compiler/cli/src/org/jetbrains/kotlin/cli/common/CLICompiler.java

@@ -66,13 +66,15 @@ public abstract class CLICompiler<A extends CommonCompilerArguments> {
         return exec(errStream, Services.EMPTY, MessageRenderer.PLAIN_RELATIVE_PATHS, args);
     }
 
-    @SuppressWarnings("UnusedDeclaration") // Used via reflection in CompilerRunnerUtil#invokeExecMethod
+    // Used via reflection in CompilerRunnerUtil#invokeExecMethod and in Eclipse plugin (see KotlinCLICompiler)
+    @SuppressWarnings("UnusedDeclaration")
     @NotNull
     public ExitCode execAndOutputXml(@NotNull PrintStream errStream, @NotNull Services services, @NotNull String... args) {
         return exec(errStream, services, MessageRenderer.XML, args);
     }
 
-    @SuppressWarnings("UnusedDeclaration") // Used via reflection in KotlinCompilerBaseTask
+    // Used via reflection in KotlinCompilerBaseTask
+    @SuppressWarnings("UnusedDeclaration")
     @NotNull
     public ExitCode execFullPathsInMessages(@NotNull PrintStream errStream, @NotNull String[] args) {
         return exec(errStream, Services.EMPTY, MessageRenderer.PLAIN_FULL_PATHS, args);

compiler/cli/src/org/jetbrains/kotlin/cli/common/CLIConfigurationKeys.java

@@ -27,6 +27,8 @@ public class CLIConfigurationKeys {
             CompilerConfigurationKey.create("allow kotlin package");
     public static final CompilerConfigurationKey<Boolean> REPORT_PERF =
             CompilerConfigurationKey.create("report performance information");
+
+    // Used in Eclipse plugin (see KotlinCLICompiler)
     public static final CompilerConfigurationKey<CompilerJarLocator> COMPILER_JAR_LOCATOR =
             CompilerConfigurationKey.create("compiler jar locator");