Do not fail when benchmark is nondeterministic

Change-Id: I162b0fc598b385dedcdac4a72ca1f2524c422ecf
diff --git a/tools/run_benchmark.py b/tools/run_benchmark.py
index e239c35..dd05251 100755
--- a/tools/run_benchmark.py
+++ b/tools/run_benchmark.py
@@ -152,7 +152,8 @@
     jdkhome = get_jdk_home(options, options.benchmark)
     cmd = [
         jdk.GetJavaExecutable(jdkhome), '-Xms8g', '-Xmx8g',
-        '-XX:+TieredCompilation', '-XX:TieredStopAtLevel=4'
+        '-XX:+TieredCompilation', '-XX:TieredStopAtLevel=4',
+        '-DBENCHMARK_IGNORE_CODE_SIZE_DIFFERENCES'
     ]
     if options.enable_assertions:
         cmd.append('-ea')