[wasm] Use the right context in the wasm-to-js wrapper.

[wasm] Use the right context in the wasm-to-js wrapper.

With this CL the wasm-to-js wrapper uses the current context at the time
the wasm module was instantiated, even if the wasm module is later
moved to a different context.

R=titzer@chromium.org
TEST=mjsunit/wasm/wasm-realms.js

[ahaas, 2016-08-22 06:01:19]

The CQ bit was checked by ahaas@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-08-22 06:01:25]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-08-22 06:22:59]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-08-22 06:23:00]

Dry run: This issue passed the CQ dry run.

[ahaas, 2016-08-22 07:57:47]

The CQ bit was checked by ahaas@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-08-22 07:57:55]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[ahaas, 2016-08-22 08:47:48]

ahaas@chromium.org changed reviewers:
+ rossberg@chromium.org

[ahaas, 2016-08-22 08:48:20]

On 2016/08/22 at 08:47:48, ahaas wrote:
> ahaas@chromium.org changed reviewers:
> + rossberg@chromium.org

Andreas, could you please test a look at the test?

[commit-bot: I haz the power, 2016-08-22 08:58:54]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-08-22 08:58:55]

Dry run: This issue passed the CQ dry run.

[rossberg, 2016-08-22 11:18:44]

On 2016/08/22 08:48:20, ahaas wrote:
> On 2016/08/22 at 08:47:48, ahaas wrote:
> > mailto:ahaas@chromium.org changed reviewers:
> > + mailto:rossberg@chromium.org
> 
> Andreas, could you please test a look at the test?

Test lgtm

[titzer, 2016-08-22 11:32:03]

lgtm

https://codereview.chromium.org/2263953002/diff/20001/src/runtime/runtime-com...
File src/runtime/runtime-compiler.cc (left):

https://codereview.chromium.org/2263953002/diff/20001/src/runtime/runtime-com...
src/runtime/runtime-compiler.cc:88: 
Spurious whitespace change