Build simpleperf in user-debug mode, and put it in /system/xbin/.

(cherry picked from commit d455de47298ada7e3532104a8e3312822a940906)

Change-Id: I53aa95e0c34957262bc9ebf3c2dff40bfee6867e
diff --git a/simpleperf/Android.mk b/simpleperf/Android.mk
index a360896..df37a22 100644
--- a/simpleperf/Android.mk
+++ b/simpleperf/Android.mk
@@ -36,7 +36,8 @@
 LOCAL_SRC_FILES := $(libsimpleperf_src_files)
 LOCAL_STATIC_LIBRARIES := libbase libcutils liblog
 LOCAL_MODULE := libsimpleperf
-LOCAL_MODULE_TAGS := optional
+LOCAL_MODULE_TAGS := debug
+LOCAL_MODULE_PATH := $(TARGET_OUT_OPTIONAL_EXECUTABLES)
 LOCAL_ADDITIONAL_DEPENDENCIES := $(LOCAL_PATH)/Android.mk
 include $(BUILD_STATIC_LIBRARY)
 
@@ -60,7 +61,8 @@
 LOCAL_WHOLE_STATIC_LIBRARIES := libsimpleperf
 LOCAL_STATIC_LIBRARIES := libbase libcutils liblog
 LOCAL_MODULE := simpleperf
-LOCAL_MODULE_TAGS := optional
+LOCAL_MODULE_TAGS := debug
+LOCAL_MODULE_PATH := $(TARGET_OUT_OPTIONAL_EXECUTABLES)
 LOCAL_ADDITIONAL_DEPENDENCIES := $(LOCAL_PATH)/Android.mk
 include $(BUILD_EXECUTABLE)