[jitzygote] Handle native methods when remapping boot image.

Child processes might call RegisterNative on boot classpath methods
(like system server), and we need to preserve the pointer provided there
before remapping the boot image methods.

Test: jitzygote build, local runs for go/art-jitzygote-perf works

Bug: 173677667
Change-Id: Ic513eb4f86f2538e00e16e92d8c41a98b7cd3574
1 file changed