Fix duplicated benchmark result insertion

Change-Id: I612bf63664ac58df6dfdf4bcbc38a5931e3100d4

src/test/java/com/android/tools/r8/benchmarks/BenchmarkResultsSingleAdapter.java

diff --git a/src/test/java/com/android/tools/r8/benchmarks/BenchmarkResultsSingleAdapter.java b/src/test/java/com/android/tools/r8/benchmarks/BenchmarkResultsSingleAdapter.java
index 6ae91ef..f85812c 100644
--- a/src/test/java/com/android/tools/r8/benchmarks/BenchmarkResultsSingleAdapter.java
+++ b/src/test/java/com/android/tools/r8/benchmarks/BenchmarkResultsSingleAdapter.java
@@ -62,7 +62,6 @@
           iteration,
           result.getRuntimeResults(),
           i -> result.getRuntimeResults().getLong(i));
-          resultsArray.add(resultObject);
       addPropertyIfValueDifferentFromRepresentative(
           resultObject,
           "resource_size",