Reland [arm64] Improve some new builtins.

Reland [arm64] Improve some new builtins.

- Simplify the variable-length pop sequence on entry. (It now uses
  smaller code with no branches.)
- Use conditional compare to merge branches where appropriate.
- Make use of Ldrsw + UntagSmiFieldMemOperand to load smis more
  efficiently.
- Only load 'undefined' and 'null' once per builtin.
- A few other small improvements.

BUG=

Committed: https://crrev.com/a1103a117c7fcd5484251336ac9f89ccafefa62f
Cr-Commit-Position: refs/heads/master@{#33235}

[jbramley, 2016-01-12 10:45:30]

jacob.bramley@arm.com changed reviewers:
+ bmeurer@chromium.org, yangguo@chromium.org

[jbramley, 2016-01-12 10:45:30]

Originally reviewed here: https://codereview.chromium.org/1537903004/

I had to change the argument handling mechanisms so that they can handle an
arbitrary number of arguments.

[jbramley, 2016-01-12 10:47:12]

https://codereview.chromium.org/1576403002/diff/1/src/full-codegen/arm64/full...
File src/full-codegen/arm64/full-codegen-arm64.cc (right):

https://codereview.chromium.org/1576403002/diff/1/src/full-codegen/arm64/full...
src/full-codegen/arm64/full-codegen-arm64.cc:2443:
ASM_LOCATION("FullCodeGenerator::EmitCallWithLoadIC");
I added these whilst debugging. Several of the surrounding functions have them
(and they are often useful) so I thought it best to leave them in.

[Benedikt Meurer, 2016-01-12 11:19:33]

lgtm

[jbramley, 2016-01-12 11:19:51]

The CQ bit was checked by jacob.bramley@arm.com

[commit-bot: I haz the power, 2016-01-12 11:20:01]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1576403002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1576403002/1

[commit-bot: I haz the power, 2016-01-12 11:57:11]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-01-12 11:58:00]

Description was changed from

==========
Reland [arm64] Improve some new builtins.

- Simplify the variable-length pop sequence on entry. (It now uses
  smaller code with no branches.)
- Use conditional compare to merge branches where appropriate.
- Make use of Ldrsw + UntagSmiFieldMemOperand to load smis more
  efficiently.
- Only load 'undefined' and 'null' once per builtin.
- A few other small improvements.

BUG=
==========

to

==========
Reland [arm64] Improve some new builtins.

- Simplify the variable-length pop sequence on entry. (It now uses
  smaller code with no branches.)
- Use conditional compare to merge branches where appropriate.
- Make use of Ldrsw + UntagSmiFieldMemOperand to load smis more
  efficiently.
- Only load 'undefined' and 'null' once per builtin.
- A few other small improvements.

BUG=

Committed: https://crrev.com/a1103a117c7fcd5484251336ac9f89ccafefa62f
Cr-Commit-Position: refs/heads/master@{#33235}
==========

[commit-bot: I haz the power, 2016-01-12 11:58:01]

Patchset 1 (id:??) landed as
https://crrev.com/a1103a117c7fcd5484251336ac9f89ccafefa62f
Cr-Commit-Position: refs/heads/master@{#33235}