support system server jars install in system_ext

Bug: 245383870
Bug: 155630745
Test:m nothing
Test:-
1.Add a jar installed in the system_ext partition toSYSTEMSERVERJARS
(e.g.b/245383870 PRODUCT_SYSTEM_SERVER_JARS_EXTRA += system_ext:oem-services)
2.Build a ROM
3.See the odex and vdex files generated in $ANDROID_PRODUCT_OUT/system_ext/framework/oat/
4.Flash the ROM to a device
5.Check the maps information of the system_server , the newly added odex has the r-xp flags
6.Run `adb shell am restart;adb root;adb shell setprop dalvik.vm.extra-opts
-verbose:deopt,heap,jit,oat,image,dex,verifier;`
7.Check ClassLoaderContext classpath size matching information
8.Run `atest art_standalone_odrefresh_tests`
`atest art_standalone_dexpreopt_tests`
`atest CtsSdkExtensionsTestCases`

Change-Id: Ib1083ee130b5fef9c23d56523868fa1e29be879a
Signed-off-by: liulvping <liulvping@xiaomi.com>
diff --git a/dexpreopt/dexpreopt.go b/dexpreopt/dexpreopt.go
index d8011d6..fdfd22e 100644
--- a/dexpreopt/dexpreopt.go
+++ b/dexpreopt/dexpreopt.go
@@ -201,6 +201,11 @@
 	if apex := global.AllApexSystemServerJars(ctx).ApexOfJar(lib); apex != "" {
 		return fmt.Sprintf("/apex/%s/javalib/%s.jar", apex, lib)
 	}
+
+	if apex := global.AllPlatformSystemServerJars(ctx).ApexOfJar(lib); apex == "system_ext" {
+		return fmt.Sprintf("/system_ext/framework/%s.jar", lib)
+	}
+
 	return fmt.Sprintf("/system/framework/%s.jar", lib)
 }