Use precise class loader context for system server jars.

This patch excludes non-Soong system server jars from dexpreopting.

System server jars should be dexpreopted together for better
performance: each jar should have all preceding system server jars
in its class loader context (that is passed to dex2oat and recorded
in the resulting .oat file to be used by the loader).

This means that we need a total order on system server jars. The
default order provided by PRODUCT_SYSTEM_SERVER_JARS is not good, as
it does not always respect genuine dependencies between jars (counter-
examples are rare, but non-trivial to fix: b/148219586).

This patch adds a post deps mutator pass that creates additional
dependencies and enforces global order. These are later used to
generate precise class loader contexts and system server classpath.

Test: Class loader contexts in the oat files for system server jars
  match expectations:

  $ oatdump --oat-file=out/target/product/walleye/system/framework/oat/arm64/com.android.location.provider.odex | grep '^classpath'
  classpath = PCL[]
  $ oatdump --oat-file=out/target/product/walleye/system/framework/oat/arm64/services.odex | grep '^classpath'
  classpath = PCL[/system/framework/com.android.location.provider.jar*1919890654]
  $ oatdump --oat-file=out/target/product/walleye/system/framework/oat/arm64/wifi-service.odex | grep '^classpath'
  classpath = PCL[/system/framework/com.android.location.provider.jar*1919890654:/system/framework/services.jar*4269704903:/system/framework/services.jar!classes2.dex*134345935]
  ...

Test: The phone boots and logcat has no scary messages related to
  class loader contexts:

  $ lunch aosp_walleye-userdebug && m
  $ adb reboot bootloader && fastboot flashall -w && adb wait-for-device
  $ adb root
  $ adb shell stop
  $ adb logcat -c
  $ adb shell setprop dalvik.vm.extra-opts -verbose:oat
  $ adb shell start
  $ adb logcat | egrep -i 'system_server: .*load.*/system/framework'
  02-03 14:14:26.912  5016  5016 I system_server: Loading /system/framework/oat/arm64/com.android.location.provider.odex with executable: 1
  02-03 14:14:26.914  5016  5016 I system_server: Successfully loaded /system/framework/oat/arm64/com.android.location.provider.odex with executable: 1
  02-03 14:14:26.914  5016  5016 I system_server: Loading /system/framework/oat/arm64/services.odex with executable: 1
  02-03 14:14:26.916  5016  5016 I system_server: Successfully loaded /system/framework/oat/arm64/services.odex with executable: 1
  02-03 14:14:26.927  5016  5016 I system_server: Loading /system/framework/oat/arm64/wifi-service.odex with executable: 1
  02-03 14:14:26.933  5016  5016 I system_server: Successfully loaded /system/framework/oat/arm64/wifi-service.odex with executable: 1
  02-03 14:14:26.933  5016  5016 I system_server: Loading /system/framework/oat/arm64/ethernet-service.odex with executable: 1
  02-03 14:14:26.934  5016  5016 I system_server: Successfully loaded /system/framework/oat/arm64/ethernet-service.odex with executable: 1
  02-03 14:14:26.946  5016  5016 I system_server: Loading /system/framework/oat/arm64/com.android.location.provider.odex with executable: 0
  02-03 14:14:26.947  5016  5016 I system_server: Successfully loaded /system/framework/oat/arm64/com.android.location.provider.odex with executable: 0
  02-03 14:14:26.947  5016  5016 I system_server: Loading /system/framework/oat/arm64/services.odex with executable: 0
  02-03 14:14:26.948  5016  5016 I system_server: Successfully loaded /system/framework/oat/arm64/services.odex with executable: 0
  02-03 14:14:26.948  5016  5016 I system_server: Loading /system/framework/oat/arm64/wifi-service.odex with executable: 0
  02-03 14:14:26.948  5016  5016 I system_server: Successfully loaded /system/framework/oat/arm64/wifi-service.odex with executable: 0
  02-03 14:14:26.949  5016  5016 I system_server: Loading /system/framework/oat/arm64/ethernet-service.odex with executable: 0
  02-03 14:14:26.949  5016  5016 I system_server: Successfully loaded /system/framework/oat/arm64/ethernet-service.odex with executable: 0
  02-03 14:14:30.480  5016  5016 I system_server: Loading /system/framework/oat/arm64/com.android.location.provider.odex with executable: 1
  02-03 14:14:30.481  5016  5016 I system_server: Successfully loaded /system/framework/oat/arm64/com.android.location.provider.odex with executable: 1

Bug: 141785760
Bug: 140451054
Bug: 148944771

Change-Id: Idac678dbd1f5fe0e381ce8e0e3561423f8a31389