Unconditionally unlink image.

In case there is a stale one. Useful when doing:
adb shell cmd package compile --reset ...

bug: 64708178
Test: adb shell cmd package compile removes the app image

(cherry picked from commit 775cdd9b94ad0094944fa8df64a52a5e43440a68)

Change-Id: Ic85eeecedd7dd762e01e943a74349b7da6063d6d
diff --git a/cmds/installd/dexopt.cpp b/cmds/installd/dexopt.cpp
index d784315..487f6b3 100644
--- a/cmds/installd/dexopt.cpp
+++ b/cmds/installd/dexopt.cpp
@@ -1067,10 +1067,9 @@
 // (re)Creates the app image if needed.
 Dex2oatFileWrapper maybe_open_app_image(const char* out_oat_path, bool profile_guided,
         bool is_public, int uid, bool is_secondary_dex) {
-    // Use app images only if it is enabled (by a set image format) and we are compiling
-    // profile-guided (so the app image doesn't conservatively contain all classes).
-    // Note that we don't create an image for secondary dex files.
-    if (is_secondary_dex || !profile_guided) {
+
+    // We don't create an image for secondary dex files.
+    if (is_secondary_dex) {
         return Dex2oatFileWrapper();
     }
 
@@ -1079,6 +1078,14 @@
         // Happens when the out_oat_path has an unknown extension.
         return Dex2oatFileWrapper();
     }
+
+    // Use app images only if it is enabled (by a set image format) and we are compiling
+    // profile-guided (so the app image doesn't conservatively contain all classes).
+    if (!profile_guided) {
+        // In case there is a stale image, remove it now. Ignore any error.
+        unlink(image_path.c_str());
+        return Dex2oatFileWrapper();
+    }
     char app_image_format[kPropertyValueMax];
     bool have_app_image_format =
             get_property("dalvik.vm.appimageformat", app_image_format, NULL) > 0;