[turbofan] Prefer add/shift over madd on ARM64

[turbofan] Prefer add/shift over madd on ARM64

Before selecting multiply-accumulate for a multiplication with add operation,
check that the multiply can't be reduced to add-with-shift. This prevents
simple multiplications by 3, 5, etc turning into register moves and madd
instructions.

Committed: https://crrev.com/b702cd97d450dad496a053eed613abed642d7656
Cr-Commit-Position: refs/heads/master@{#28976}

[martyn.capewell, 2015-06-11 16:25:08]

martyn.capewell@arm.com changed reviewers:
+ bmeurer@chromium.org, ulan@chromium.org

[Benedikt Meurer, 2015-06-12 04:36:33]

The CQ bit was checked by bmeurer@chromium.org

[Benedikt Meurer, 2015-06-12 04:36:34]

lgtm

[commit-bot: I haz the power, 2015-06-12 04:36:44]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1180863002/1

[commit-bot: I haz the power, 2015-06-12 05:01:04]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-06-12 05:01:15]

Patchset 1 (id:??) landed as
https://crrev.com/b702cd97d450dad496a053eed613abed642d7656
Cr-Commit-Position: refs/heads/master@{#28976}