Factor out prelowerPhi for 32-bit targets. Disable adv phi lowering for ARM.

Factor out prelowerPhi for 32-bit targets. Disable adv phi lowering for ARM.

This way, prelowerPhi can be shared between 32-bit targets (split 64-bit
values into 32-bit ones, and legalize undef). Suggestions from template
experts on how to share prelowerPhi welcome. I'm not particularly happy
with the first pass in that legalizeUndef has to be made public (though
other methods used are also public). Also the methods required from the
template type TargetT aren't clear without looking through the code.

The current advanced phi lowering code depends on lowerPhiAssignments.
That is a special case of lowerAssign that does some adhoc register
allocation. The current adhoc register allocation doesn't work as
well when a target may need to spill more than one register.
Disable that optimization for ARM for now, until we have a better
way that works for ARM, and enable O2 cross testing on ARM.


BUG= https://code.google.com/p/nativeclient/issues/detail?id=4076
R=stichnot@chromium.org

Committed: https://gerrit.chromium.org/gerrit/gitweb?p=native_client/pnacl-subzero.git;a=commit;h=53483691eba6e23de63afe0579b436002d06d187

[jvoung (off chromium), 2015-07-15 20:45:11]

jvoung@chromium.org changed reviewers:
+ jpp@chromium.org, stichnot@chromium.org

[Jim Stichnoth, 2015-07-15 22:33:17]

LGTM, but unfortunately I can't say much about template wizardry.

[jvoung (off chromium), 2015-07-16 17:47:51]

Committed patchset #3 (id:30009) manually as
53483691eba6e23de63afe0579b436002d06d187 (presubmit successful).