[perf-prof][arm64] Emit unwinding info to record the saved FP

[perf-prof][arm64] Emit unwinding info to record the saved FP

When emitting a frame, we always push the old frame pointer at offset 0 relative
to the new frame pointer. However, we didn't emit DWARF opcodes to inform perf
of this.

BUG=

Review-Url: https://codereview.chromium.org/2795253002
Cr-Commit-Position: refs/heads/master@{#44384}
Committed: https://chromium.googlesource.com/v8/v8/+/2db1f598c56fb6e43c5c6f02062bc6793843a34f

[Pierre Langlois, 2017-04-04 14:48:04]

pierre.langlois@arm.com changed reviewers:
+ danno@chromium.org, jarin@chromium.org

[Jarin, 2017-04-04 14:59:22]

lgtm. Thanks!

[Pierre Langlois, 2017-04-04 15:00:07]

The CQ bit was checked by pierre.langlois@arm.com

[commit-bot: I haz the power, 2017-04-04 15:00:20]

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, 2017-04-04 15:37:06]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1491318007204560, "parent_rev":
"eddf90c4a750f88c75c11f344675f27942da0400", "commit_rev":
"2db1f598c56fb6e43c5c6f02062bc6793843a34f"}

[commit-bot: I haz the power, 2017-04-04 15:37:12]

Description was changed from

==========
[perf-prof][arm64] Emit unwinding info to record the saved FP

When emitting a frame, we always push the old frame pointer at offset 0 relative
to the new frame pointer. However, we didn't emit DWARF opcodes to inform perf
of this.

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

to

==========
[perf-prof][arm64] Emit unwinding info to record the saved FP

When emitting a frame, we always push the old frame pointer at offset 0 relative
to the new frame pointer. However, we didn't emit DWARF opcodes to inform perf
of this.

BUG=

Review-Url: https://codereview.chromium.org/2795253002
Cr-Commit-Position: refs/heads/master@{#44384}
Committed:
https://chromium.googlesource.com/v8/v8/+/2db1f598c56fb6e43c5c6f02062bc679384...
==========

[commit-bot: I haz the power, 2017-04-04 15:37:13]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/v8/v8/+/2db1f598c56fb6e43c5c6f02062bc679384...