[turbofan][x64] Try harder to use memory addressing modes.

[turbofan][x64] Try harder to use memory addressing modes.

When we don't have a base, and the displacement returned by the
BaseWithIndexAndDisplacement64Matcher cannot be encoded as immediate,
we can still try to utilize the scale factor matching by just using
the displacement as base. This happens when we do indexed memory
accesses to known addresses.

R=jarin@chromium.org

Committed: https://crrev.com/f16a7fe37c80a6fd13fe059c66e9791a870157f0
Cr-Commit-Position: refs/heads/master@{#41016}

[Benedikt Meurer, 2016-11-16 05:21:58]

The CQ bit was checked by bmeurer@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-11-16 05:22:02]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[Benedikt Meurer, 2016-11-16 05:24:17]

Hey Jaro,

Ran across this while doing the Mandreel constant typed array stuff.
Please take a look.

Thanks,
Benedikt

[commit-bot: I haz the power, 2016-11-16 05:46:40]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-11-16 05:46:41]

Dry run: This issue passed the CQ dry run.

[Jarin, 2016-11-16 07:36:24]

lgtm

[Benedikt Meurer, 2016-11-16 07:36:37]

The CQ bit was checked by bmeurer@chromium.org

[commit-bot: I haz the power, 2016-11-16 07:36:39]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-11-16 07:38:40]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-11-17 22:35:21]

Description was changed from

==========
[turbofan][x64] Try harder to use memory addressing modes.

When we don't have a base, and the displacement returned by the
BaseWithIndexAndDisplacement64Matcher cannot be encoded as immediate,
we can still try to utilize the scale factor matching by just using
the displacement as base. This happens when we do indexed memory
accesses to known addresses.

R=jarin@chromium.org
==========

to

==========
[turbofan][x64] Try harder to use memory addressing modes.

When we don't have a base, and the displacement returned by the
BaseWithIndexAndDisplacement64Matcher cannot be encoded as immediate,
we can still try to utilize the scale factor matching by just using
the displacement as base. This happens when we do indexed memory
accesses to known addresses.

R=jarin@chromium.org

Committed: https://crrev.com/f16a7fe37c80a6fd13fe059c66e9791a870157f0
Cr-Commit-Position: refs/heads/master@{#41016}
==========

[commit-bot: I haz the power, 2016-11-17 22:35:22]

Patchset 1 (id:??) landed as
https://crrev.com/f16a7fe37c80a6fd13fe059c66e9791a870157f0
Cr-Commit-Position: refs/heads/master@{#41016}