Add valgrind support to compiler arena allocator.

Change-Id: Id9974301d3810bfac968ee562b01a11098e402c2
diff --git a/build/Android.common.mk b/build/Android.common.mk
index ac1be1e..70fa6d8 100644
--- a/build/Android.common.mk
+++ b/build/Android.common.mk
@@ -104,6 +104,7 @@
 ART_C_INCLUDES := \
 	external/gtest/include \
 	external/valgrind/main/include \
+	external/valgrind/main \
 	external/zlib \
 	frameworks/compile/mclinker/include