Fixed various simulator-related space leaks.

Fixed various simulator-related space leaks.

Alas, this involved quite a bit of copy-n-paste between the
architectures, but this is caused by the very convoluted
relationships, lifetimes and distribution of responsibilities. This
should really be cleaned up by moving code around and using STL maps,
but that's not really a priority right now.

Bonus: Fixed leaks in the ARM64 disassembler tests.

Committed: https://crrev.com/84aa494ebcbf8f55758cbc8c79740290fdbda8ae
Cr-Commit-Position: refs/heads/master@{#28496}

[Sven Panne, 2015-05-19 09:19:38]

svenpanne@chromium.org changed reviewers:
+ hpayer@chromium.org

[Sven Panne, 2015-05-19 09:19:38]

This should fix the problems encountered while trying to debug
chromium:489006...

[Hannes Payer (out of office), 2015-05-19 15:05:56]

On 2015/05/19 09:19:38, Sven Panne wrote:
> This should fix the problems encountered while trying to debug
> chromium:489006...

lgtm

[Sven Panne, 2015-05-20 05:54:56]

The CQ bit was checked by svenpanne@chromium.org

[commit-bot: I haz the power, 2015-05-20 05:55:03]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1132943007/40001

[commit-bot: I haz the power, 2015-05-20 05:56:12]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2015-05-20 05:56:23]

Patchset 3 (id:??) landed as
https://crrev.com/84aa494ebcbf8f55758cbc8c79740290fdbda8ae
Cr-Commit-Position: refs/heads/master@{#28496}