Clear dalvik-cache before running test on host.

The test 137-cfi is run twice and the stale data causes problems.

Change-Id: I631cc73c8e832534d0a276b7d23a654adeacebee
diff --git a/test/etc/run-test-jar b/test/etc/run-test-jar
index 63ec2a0..8245ccf 100755
--- a/test/etc/run-test-jar
+++ b/test/etc/run-test-jar
@@ -541,6 +541,7 @@
 
     cd $ANDROID_BUILD_TOP
 
+    rm -rf ${DEX_LOCATION}/dalvik-cache/
     $mkdir_cmdline || exit 1
     $dex2oat_cmdline || { echo "Dex2oat failed." >&2 ; exit 2; }