[runtime] Remove the redundant %_IsObject intrinsic.

[runtime] Remove the redundant %_IsObject intrinsic.

%_IsObject(foo) is equivalent to typeof foo === 'object' and has
exactly the same optimizations, so there's zero need for %_IsObject
in our code base.

R=mstarzinger@chromium.org

Committed: https://crrev.com/b4c7399464481d31c2a78a64f79a6c7e09f1add9
Cr-Commit-Position: refs/heads/master@{#30380}

[Benedikt Meurer, 2015-08-26 10:31:19]

Hey Michi,

Removing redundant code...
Please take a look.

Thanks,
Benedikt

[Yang, 2015-08-26 10:35:18]

On 2015/08/26 10:31:19, Benedikt Meurer wrote:
> Hey Michi,
> 
> Removing redundant code...
> Please take a look.
> 
> Thanks,
> Benedikt

There goes another 1k LoC :D
LGTM for runtime/* and full-codegen/*

[Michael Starzinger, 2015-08-26 10:47:11]

LGTM. LOL.

https://codereview.chromium.org/1313903003/diff/1/test/cctest/compiler/test-r...
File test/cctest/compiler/test-run-jscalls.cc (left):

https://codereview.chromium.org/1313903003/diff/1/test/cctest/compiler/test-r...
test/cctest/compiler/test-run-jscalls.cc:160: FunctionTester T("(function(a) {
return %_IsObject(a); })");
nit: We might want to preserve this test for another inline intrinsic. Ideally
one that is not yet handled by JSIntrinsicLowering.

[Benedikt Meurer, 2015-08-26 10:50:42]

https://codereview.chromium.org/1313903003/diff/1/test/cctest/compiler/test-r...
File test/cctest/compiler/test-run-jscalls.cc (left):

https://codereview.chromium.org/1313903003/diff/1/test/cctest/compiler/test-r...
test/cctest/compiler/test-run-jscalls.cc:160: FunctionTester T("(function(a) {
return %_IsObject(a); })");
On 2015/08/26 10:47:10, Michael Starzinger wrote:
> nit: We might want to preserve this test for another inline intrinsic. Ideally
> one that is not yet handled by JSIntrinsicLowering.

Done.

[Benedikt Meurer, 2015-08-26 10:50:46]

The CQ bit was checked by bmeurer@chromium.org

[Benedikt Meurer, 2015-08-26 10:50:46]

The patchset sent to the CQ was uploaded after l-g-t-m from
mstarzinger@chromium.org, yangguo@chromium.org
Link to the patchset: https://codereview.chromium.org/1313903003/#ps20001
(title: "Address Michis comment.")

[commit-bot: I haz the power, 2015-08-26 10:50:54]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1313903003/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1313903003/20001

[commit-bot: I haz the power, 2015-08-26 11:28:05]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-08-26 11:28:17]

Patchset 2 (id:??) landed as
https://crrev.com/b4c7399464481d31c2a78a64f79a6c7e09f1add9
Cr-Commit-Position: refs/heads/master@{#30380}