Use ldr for movs out of stack slots (instead of mov reg, [sp/fp]).

Use ldr for movs out of stack slots (instead of mov reg, [sp/fp]).

So far we've been using ldr/str (32-bit) to load/store
the whole stack slot, independent of the variable type.

Toggle on some tests that didn't have an Om1 variant
previously. Didn't toggle everything since there are still
some problems with liveness from code being unimplemented.

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=c207d51ea50154e73891cb306bf00c8eccf7306e

[jvoung (off chromium), 2015-05-27 17:24:18]

jvoung@chromium.org changed reviewers:
+ kschimpf@google.com, mtrofin@chromium.org, stichnot@chromium.org

[Jim Stichnoth, 2015-05-27 18:02:31]

lgtm, but I don't see any tests?  Will you be eventually enabling the TODO tests
in int-arg.ll?

[jvoung (off chromium), 2015-05-27 20:12:05]

On 2015/05/27 18:02:31, stichnot wrote:
> lgtm, but I don't see any tests?  Will you be eventually enabling the TODO
tests
> in int-arg.ll?

Ah right forgot about those!. I'm working on addProlog right now, and I think
those TODO tests will need the  prolog code.

[jvoung (off chromium), 2015-05-27 21:34:39]

Committed patchset #3 (id:40001) manually as
c207d51ea50154e73891cb306bf00c8eccf7306e (presubmit successful).