Revert "Keep a canonical list of shared function infos."

Revert "Keep a canonical list of shared function infos."

Speculative revert in the hopes of fixing serializer crashes seen in canary.

This reverts commit c1669450834436508e0007885eb7ac266cbcf083, as well as
followup change "Do not look for existing shared function info when compiling a new script."
(commit 7c43967bb73783b46c2ccf9cdd0fa716b74ce278).

BUG=chromium:503552, v8:4132
TBR=yangguo@chromium.org
LOG=n

Committed: https://crrev.com/3164aa7483cb476da84895a3c9810015758fccf9
Cr-Commit-Position: refs/heads/master@{#29241}

[adamk, 2015-06-23 22:08:09]

adamk@chromium.org changed reviewers:
+ yangguo@chromium.org

[adamk, 2015-06-23 22:11:08]

The CQ bit was checked by adamk@chromium.org

[commit-bot: I haz the power, 2015-06-23 22:11:32]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1207583002/1

[commit-bot: I haz the power, 2015-06-23 22:59:29]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-06-23 22:59:39]

Patchset 1 (id:??) landed as
https://crrev.com/3164aa7483cb476da84895a3c9810015758fccf9
Cr-Commit-Position: refs/heads/master@{#29241}