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64 bit zygote is the "primary" and the system server is run
as a 64 bit process.

(cherry picked from commit 7cdbbcab)

Change-Id: I56363e08b546dead14c2ee46b0069235cc4597e8

Required due to change 5a7ee9ad63 which makes
app_process a symlink to the primary zygote.

Change-Id: I940f6302db97f74dd57112e310014e989dc586e5

Note that init.zygote64.rc, which supports a "pure"
64 bit zygote is around only for testing.

The life cycles of both zygotes are controlled by init,
and the assumption here is that they will be available
always. We start the system_server in 32 bit mode.

Note that the distinction between "primary" and "secondary"
simply defines the order in which ABI support is queried,
there's no real requirement that the primary zygote supports
the primary ABI of the device.

bug: 13647418

Change-Id: Id0be001ea6f934c3c2022d89a63aae9fae66cc38

This allows us to choose different configs depending on
whether or not the target is 64 capable, and what its preferred
default is.

bug: 13647418
Change-Id: Ie1ce4245a3add7544c87d27c635ee390f4062523