[types] Use unified integral representation bits.

[types] Use unified integral representation bits.

We don't need to distinguish between signed and unsigned integral
representations in the big boy type system. It actually even hurts
in some cases. The representation is only about the way the values
are mapped to bits in memory/registers, but the interpretation of
the bits is specified by the semantic dimension.

R=jarin@chromium.org

Committed: https://crrev.com/6471fbf72ce07b54f154d550724ac063862294c3
Cr-Commit-Position: refs/heads/master@{#31771}

[Benedikt Meurer, 2015-11-04 07:48:16]

bmeurer@chromium.org changed reviewers:
+ rossberg@chromium.org

[Benedikt Meurer, 2015-11-04 07:48:17]

Hey Jaro,

Here's the patch we talked about offline.
Please take a look.

Thanks,
Benedikt

[Jarin, 2015-11-04 08:00:47]

lgtm

[Benedikt Meurer, 2015-11-04 08:04:10]

The CQ bit was checked by bmeurer@chromium.org

[commit-bot: I haz the power, 2015-11-04 08:04:27]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1416953006/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1416953006/1

[commit-bot: I haz the power, 2015-11-04 08:05:42]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-11-04 08:06:25]

Patchset 1 (id:??) landed as
https://crrev.com/6471fbf72ce07b54f154d550724ac063862294c3
Cr-Commit-Position: refs/heads/master@{#31771}