Reuse the pre-computed spawnSummary.
Add an integration test for remote cache hits status line.

RELNOTES: None.
PiperOrigin-RevId: 222621275
diff --git a/src/main/java/com/google/devtools/build/lib/runtime/BuildSummaryStatsModule.java b/src/main/java/com/google/devtools/build/lib/runtime/BuildSummaryStatsModule.java
index 8666ce9..6c7a4d7 100644
--- a/src/main/java/com/google/devtools/build/lib/runtime/BuildSummaryStatsModule.java
+++ b/src/main/java/com/google/devtools/build/lib/runtime/BuildSummaryStatsModule.java
@@ -140,7 +140,7 @@
 
       String spawnSummary = spawnStats.getSummary();
       if (statsSummary) {
-        reporter.handle(Event.info(spawnStats.getSummary()));
+        reporter.handle(Event.info(spawnSummary));
         reporter.handle(
             Event.info(
                 String.format(