Reland [arm64][turbofan]: Handle any immediate shift.

Reland [arm64][turbofan]: Handle any immediate shift.

With this patch, we can generate simple immediate-shift instructions for
immediates outside the range "0 <= imm < width". Several related
instruction selectors have also been updated accordingly.

Example of generated code:

    ---- Before ---         ---- After ----
    movz w0, #33            lsr w0, w1, #1
    lsr  w0, w1, w0

BUG=

Committed: https://crrev.com/065b2374aa4f8d9247fb33fe051982c8c8a087a0
Cr-Commit-Position: refs/heads/master@{#28977}

[jbramley, 2015-06-11 16:06:49]

jacob.bramley@arm.com changed reviewers:
+ bmeurer@chromium.org, ulan@chromium.org

[jbramley, 2015-06-11 16:06:50]

Let's try again.

Ironically, the problem was an out-of-range shift in one of the tests.

[Benedikt Meurer, 2015-06-12 04:37:02]

The CQ bit was checked by bmeurer@chromium.org

[Benedikt Meurer, 2015-06-12 04:37:02]

lgtm

[commit-bot: I haz the power, 2015-06-12 04:37:15]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1179893003/1

[commit-bot: I haz the power, 2015-06-12 05:03:09]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-06-12 05:03:27]

Patchset 1 (id:??) landed as
https://crrev.com/065b2374aa4f8d9247fb33fe051982c8c8a087a0
Cr-Commit-Position: refs/heads/master@{#28977}