Start automatically generating operator<<s for enums.

Change-Id: I0f53db089b9a1ba38ce82b75ab22448877be67e0
diff --git a/build/Android.common.mk b/build/Android.common.mk
index 41edefa..28ac65b 100644
--- a/build/Android.common.mk
+++ b/build/Android.common.mk
@@ -104,7 +104,6 @@
 LIBART_COMMON_SRC_FILES := \
 	src/atomic.cc.arm \
 	src/card_table.cc \
-	src/constants.cc \
 	src/check_jni.cc \
 	src/class_linker.cc \
 	src/class_loader.cc \
@@ -268,6 +267,12 @@
 $(error unsupported HOST_ARCH=$(HOST_ARCH))
 endif # HOST_ARCH != x86
 
+LIBART_ENUM_OPERATOR_OUT_HEADER_FILES := \
+	src/indirect_reference_table.h \
+	src/instruction_set.h \
+	src/invoke_type.h \
+	src/mutex.h
+
 LIBARTTEST_COMMON_SRC_FILES := \
 	test/StackWalk/stack_walk_jni.cc \
 	test/ReferenceMap/stack_walk_refmap_jni.cc