Revert of Release streamed script resources after it was compiled (patchset #1 id:1 of https://codereview.chromium.org/2297523002/ )

Reason for revert:
Seems to break webkit unit tests:
https://build.chromium.org/p/client.v8.fyi/builders/V8-Blink%20Linux%2064/builds/9360
https://build.chromium.org/p/client.v8.fyi/builders/V8-Blink%20Linux%2064%20%28dbg%29/builds/5503

Original issue's description:
> Release streamed script resources after it was compiled
>
> Otherwise, we'd hold on to the resources until the embedder frees them
> which might take a long time
>
> R=marja@chromium.org,verwaest@chromium.org
> BUG=
>
> Committed: https://crrev.com/877dac34465c018bb534b7781fbe242ae4e33c32
> Cr-Commit-Position: refs/heads/master@{#38999}

TBR=marja@chromium.org,verwaest@chromium.org,jochen@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=

Review-Url: https://codereview.chromium.org/2290173003
Cr-Commit-Position: refs/heads/master@{#39012}