Vixl: Update the VIXL interface to VIXL 1.7 and enable VIXL debug.

This patch updates the interface to VIXL 1.7 and enables the debug version of
VIXL when ART is built in debug mode.

Change-Id: I443fb941bec3cffefba7038f93bb972e6b7d8db5
Signed-off-by: Serban Constantinescu <serban.constantinescu@arm.com>
diff --git a/build/Android.common_build.mk b/build/Android.common_build.mk
index c6e2b95..b3d1380 100644
--- a/build/Android.common_build.mk
+++ b/build/Android.common_build.mk
@@ -248,6 +248,7 @@
 art_debug_cflags := \
   -O2 \
   -DDYNAMIC_ANNOTATIONS_ENABLED=1 \
+  -DVIXL_DEBUG \
   -UNDEBUG
 
 art_host_non_debug_cflags := $(art_non_debug_cflags)