ART: Run cctest_vixl in test-art-host

Added a make rule "test-art-host-vixl" that will run the vixl test
when the host is built in 64b mode.

Change-Id: I896f998432d089e6554d2a9c9aa92cb9f89094ec
diff --git a/Android.mk b/Android.mk
index fe631d9..2196d59 100644
--- a/Android.mk
+++ b/Android.mk
@@ -150,9 +150,22 @@
 ########################################################################
 # host test targets
 
+.PHONY: test-art-host-vixl
+ifneq ($(BUILD_HOST_64bit),)
+test-art-host-vixl: $(ANDROID_HOST_OUT)/bin/cctest_vixl
+	$(ANDROID_HOST_OUT)/bin/cctest_vixl --run_all
+	@echo vixl PASSED
+
+else
+# vixl test needs 64b host.
+test-art-host-vixl:
+	@echo vixl test only runnable with 64b host build.
+
+endif
+
 # "mm test-art-host" to build and run all host tests
 .PHONY: test-art-host
-test-art-host: test-art-host-gtest test-art-host-oat test-art-host-run-test
+test-art-host: test-art-host-gtest test-art-host-oat test-art-host-run-test test-art-host-vixl
 	@echo test-art-host PASSED
 
 .PHONY: test-art-host-interpreter