New flag --perf_basic_prof_only_functions

New flag --perf_basic_prof_only_functions

Restricts linux perf-event code range reporting to functions only (i.e. on
stubs.) While this makes the gathered ticks less accurate, it reduces the
growth of the /tmp/perf-${pid}.map file.

BUG=v8:3453
R=hablich@chromium.org,danno@chromium.org
LOG=N

Committed: https://crrev.com/9da3ab661fe7190fcb99bd99db30cf95913d3659
Cr-Commit-Position: refs/heads/master@{#30179}

[danno, 2015-08-14 14:15:35]

The CQ bit was checked by danno@chromium.org

[danno, 2015-08-14 14:15:35]

lgtm

[commit-bot: I haz the power, 2015-08-14 14:15:39]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1292743002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1292743002/1

[commit-bot: I haz the power, 2015-08-14 14:18:42]

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

[commit-bot: I haz the power, 2015-08-14 14:18:43]

Try jobs failed on following builders:
  v8_presubmit on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_presubmit/builds/4924)

[ofrobots, 2015-08-14 14:50:02]

The CQ bit was checked by ofrobots@google.com

[commit-bot: I haz the power, 2015-08-14 14:50:07]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1292743002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1292743002/1

[commit-bot: I haz the power, 2015-08-14 14:51:56]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-08-14 14:52:18]

Patchset 1 (id:??) landed as
https://crrev.com/9da3ab661fe7190fcb99bd99db30cf95913d3659
Cr-Commit-Position: refs/heads/master@{#30179}

[ofrobots, 2015-09-17 19:01:28]

Not sure why the second patch-set showed up here. I was trying to create a new
code-review for it. Please ignore.

[ofrobots, 2015-10-30 18:55:20]

Patchset #2 (id:20001) has been deleted