Set single warmup run for R8 partial benchmarks

Change-Id: I89044d76ec233b0e09a751dc43ae4fa48cfffd51
diff --git a/src/test/java/com/android/tools/r8/benchmarks/appdumps/AppDumpBenchmarkBuilder.java b/src/test/java/com/android/tools/r8/benchmarks/appdumps/AppDumpBenchmarkBuilder.java
index bd3609b..bfe2cd6 100644
--- a/src/test/java/com/android/tools/r8/benchmarks/appdumps/AppDumpBenchmarkBuilder.java
+++ b/src/test/java/com/android/tools/r8/benchmarks/appdumps/AppDumpBenchmarkBuilder.java
@@ -386,7 +386,7 @@
       ThrowableConsumer<? super R8PartialTestBuilder> configuration) {
     return environment ->
         BenchmarkBase.runner(environment)
-            .setWarmupIterations(0)
+            .setWarmupIterations(1)
             .run(
                 results -> {
                   CompilerDump dump = builder.getExtractedDump(environment);