X87: Debugger: use debug break slots instead of ICs (except for calls).

X87: Debugger: use debug break slots instead of ICs (except for calls).

port a8a4c364c2ad4c1e5f4c6e1f1580d75ff1a35a4f (r29487).

original commit message:

BUG=

Committed: https://crrev.com/c935d2b9ee142fcc89e900533b9b5610c43520ec
Cr-Commit-Position: refs/heads/master@{#29508}

[chunyang.dai, 2015-07-07 02:11:05]

chunyang.dai@intel.com changed reviewers:
+ weiliang.lin@intel.com

[chunyang.dai, 2015-07-07 02:11:05]

PTAL.

[Weiliang, 2015-07-07 07:40:28]

The CQ bit was checked by weiliang.lin@intel.com

[Weiliang, 2015-07-07 07:40:29]

lgtm

[commit-bot: I haz the power, 2015-07-07 07:40:42]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1227603002/1

[commit-bot: I haz the power, 2015-07-07 08:04:14]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-07-07 08:04:33]

Patchset 1 (id:??) landed as
https://crrev.com/c935d2b9ee142fcc89e900533b9b5610c43520ec
Cr-Commit-Position: refs/heads/master@{#29508}