X87: [Interpreter] Pass context to interpreter bytecode handlers and add LoadConstextSlot

X87: [Interpreter] Pass context to interpreter bytecode handlers and add LoadConstextSlot

   For X87 platform, it has the same general register as ia32 and it will spill the
   context to the stack too.

port bfdc22d7fc1bc046a38770a676619eee613222f3 (r29325).

original commit message:

    Passes the current context to bytecode interpreter handlers. This is held in the
    context register on all architectures except for ia32 where there are too few
    registers and it is instead spilled to the stack.

    Also changes Load/StoreRegister to use kMachAnyTagged representation since they
    should only ever hold tagged values.

BUG=

Committed: https://crrev.com/b5911513ccb137307f14844ac202fcc905a3087e
Cr-Commit-Position: refs/heads/master@{#30368}

[chunyang.dai, 2015-08-25 07:54:40]

chunyang.dai@intel.com changed reviewers:
+ mstarzinger@chromium.org, rmcilroy@chromium.org, weiliang.lin@intel.com

[chunyang.dai, 2015-08-25 07:54:40]

PTAL.

[Michael Starzinger, 2015-08-25 17:33:14]

LGTM.

[chunyang.dai, 2015-08-26 00:37:59]

The CQ bit was checked by chunyang.dai@intel.com

[commit-bot: I haz the power, 2015-08-26 00:38:16]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1316583003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1316583003/1

[commit-bot: I haz the power, 2015-08-26 01:17:14]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-08-26 01:17:23]

Patchset 1 (id:??) landed as
https://crrev.com/b5911513ccb137307f14844ac202fcc905a3087e
Cr-Commit-Position: refs/heads/master@{#30368}