[wasm] [asm.js] Avoid expensive GetLineNumber up front in asm-typer.

[wasm] [asm.js] Avoid expensive GetLineNumber up front in asm-typer.

In switching to incremental parsing, we switched to pre-computing
line numbers for forward declarations. This is expensive,
because GetLineNumber reparses lines.

Also, switch typing maps to unordered_map (as they appear hot).

BUG=v8:4203
R=titzer@chromium.org

Committed: https://crrev.com/52fd3c1ec5b443de7333f1b53ed25cbc754bd412
Cr-Commit-Position: refs/heads/master@{#41525}

[bradnelson, 2016-12-06 10:36:54]

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

[commit-bot: I haz the power, 2016-12-06 10:37:05]

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

[titzer, 2016-12-06 10:42:41]

On 2016/12/06 10:35:34, bradnelson wrote:

lgtm

[commit-bot: I haz the power, 2016-12-06 11:05:36]

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

[commit-bot: I haz the power, 2016-12-06 11:05:36]

Dry run: This issue passed the CQ dry run.

[bradn, 2016-12-06 14:05:48]

The CQ bit was checked by bradnelson@google.com

[commit-bot: I haz the power, 2016-12-06 14:06:00]

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, 2016-12-06 14:07:34]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1481033148034270, "parent_rev":
"d962cb7bbc63f3eb469580a82ec54b2bd164f4bf", "commit_rev":
"d1c46e50b9721e7c440c83f6496e651418b34940"}

[commit-bot: I haz the power, 2016-12-06 14:07:39]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-12-06 14:07:59]

Description was changed from

==========
[wasm] [asm.js] Avoid expensive GetLineNumber up front in asm-typer.

In switching to incremental parsing, we switched to pre-computing
line numbers for forward declarations. This is expensive,
because GetLineNumber reparses lines.

Also, switch typing maps to unordered_map (as they appear hot).

BUG=v8:4203
R=titzer@chromium.org
==========

to

==========
[wasm] [asm.js] Avoid expensive GetLineNumber up front in asm-typer.

In switching to incremental parsing, we switched to pre-computing
line numbers for forward declarations. This is expensive,
because GetLineNumber reparses lines.

Also, switch typing maps to unordered_map (as they appear hot).

BUG=v8:4203
R=titzer@chromium.org

Committed: https://crrev.com/52fd3c1ec5b443de7333f1b53ed25cbc754bd412
Cr-Commit-Position: refs/heads/master@{#41525}
==========

[commit-bot: I haz the power, 2016-12-06 14:08:00]

Patchset 1 (id:??) landed as
https://crrev.com/52fd3c1ec5b443de7333f1b53ed25cbc754bd412
Cr-Commit-Position: refs/heads/master@{#41525}