Store the next serial number in the function cache rather than in the isolate.Don't overwrite existi

Don't overwrite existing serial numbers on the function template, otherwise instantiating the function for a new context causes the serial number to bump.

Committed: https://crrev.com/1e638c3610ec6938e5fb16c42018642195782fb2
Cr-Commit-Position: refs/heads/master@{#27048}

[Toon Verwaest, 2015-03-06 14:24:29]

verwaest@chromium.org changed reviewers:
+ dcarney@chromium.org, yangguo@chromium.org

[Toon Verwaest, 2015-03-06 14:24:30]

PTAL

[Yang, 2015-03-06 15:01:45]

On 2015/03/06 14:24:30, Toon Verwaest wrote:
> PTAL

lgtm.

[Toon Verwaest, 2015-03-06 15:02:18]

The CQ bit was checked by verwaest@chromium.org

[Toon Verwaest, 2015-03-06 15:02:18]

The patchset sent to the CQ was uploaded after l-g-t-m from yangguo@chromium.org
Link to the patchset: https://codereview.chromium.org/988693003/#ps60001 (title:
" ")

[commit-bot: I haz the power, 2015-03-06 15:03:16]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/988693003/60001

[commit-bot: I haz the power, 2015-03-06 15:25:56]

Committed patchset #4 (id:60001)

[commit-bot: I haz the power, 2015-03-06 15:26:08]

Patchset 4 (id:??) landed as
https://crrev.com/1e638c3610ec6938e5fb16c42018642195782fb2
Cr-Commit-Position: refs/heads/master@{#27048}

[Toon Verwaest, 2015-03-09 10:53:29]

A revert of this CL (patchset #4 id:60001) has been created in
https://codereview.chromium.org/993533003/ by verwaest@chromium.org.

The reason for reverting is: This doesn't do what it's supposed to do. The
problem seems to lie on the blink side, people aren't reusing their
FunctionTemplates (or creating them when not necessary)..