ARM32: Lower more integer intrinsics and test.

ARM32: Lower more integer intrinsics and test.

Lower stacksave/restore.
Lower ctlz, cttz, bswap, and popcount. Popcount is just
done with a helper call. Ctz can use the clz instruction
after reversing the bits.

We can only crosstest stacksave/restore for now which
happens to be written in C for the C99 VLAs. The CXX
crosstests I can't seem to compile with the arm-cross-g++
(missing headers), so I will check that later after
resolving the cross compilation issue.

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

Committed: https://gerrit.chromium.org/gerrit/gitweb?p=native_client/pnacl-subzero.git;a=commit;h=f645d8539e6dd8d0d7d6b604f36b9cc7b05d1886

[jvoung (off chromium), 2015-07-08 17:43:20]

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

[John, 2015-07-08 21:49:21]

lgtm

https://codereview.chromium.org/1222943003/diff/80001/src/IceTargetLoweringAR...
File src/IceTargetLoweringARM32.h (right):

https://codereview.chromium.org/1222943003/diff/80001/src/IceTargetLoweringAR...
src/IceTargetLoweringARM32.h:379:
Context.getLastInserted()->setDestNonKillable();
_set_dest_nonkillable is used in pretty much every target. Maybe define it in
TargetLowering?

[jvoung (off chromium), 2015-07-09 01:11:24]

https://codereview.chromium.org/1222943003/diff/80001/src/IceTargetLoweringAR...
File src/IceTargetLoweringARM32.h (right):

https://codereview.chromium.org/1222943003/diff/80001/src/IceTargetLoweringAR...
src/IceTargetLoweringARM32.h:379:
Context.getLastInserted()->setDestNonKillable();
On 2015/07/08 21:49:21, John wrote:
> _set_dest_nonkillable is used in pretty much every target. Maybe define it in
> TargetLowering?

Done.

[jvoung (off chromium), 2015-07-09 17:35:14]

Committed patchset #6 (id:90001) manually as
f645d8539e6dd8d0d7d6b604f36b9cc7b05d1886 (presubmit successful).