Use the thumb2 assembler for the optimizing compiler.

Change-Id: I2b058f4433504dc3299c06f5cb0b5ab12f34aa82
diff --git a/build/Android.common_test.mk b/build/Android.common_test.mk
index ed07129..470ddfd 100644
--- a/build/Android.common_test.mk
+++ b/build/Android.common_test.mk
@@ -23,7 +23,8 @@
 # rule name such as test-art-host-oat-optimizing-HelloWorld64.
 ART_TEST_KNOWN_BROKEN := \
   test-art-host-oat-optimizing-SignalTest64 \
-  test-art-host-oat-optimizing-SignalTest32
+  test-art-host-oat-optimizing-SignalTest32 \
+  test-art-target-oat-optimizing-SignalTest32
 
 # List of known failing tests that when executed won't cause test execution to not finish.
 # The test name must be the full rule name such as test-art-host-oat-optimizing-HelloWorld64.