Impala Public Jenkins has submitted this change and it was merged. ( 
http://gerrit.cloudera.org:8080/11926 )

Change subject: Add a handy tool to collapse threads in pstacks
......................................................................

Add a handy tool to collapse threads in pstacks

This commit imports a very useful tool that summarizes/collapses
threads from gdb pstacks. I found it very useful in analyzing
pstacks with large number of threads, specially in Impala's context.

Credit to the original author at https://poormansprofiler.org/
(Slightly modified for better input handling).

Example Usages:
---------------
summarize-pstacks foo.pstack
summarize-pstacks foo_*.pstack
cat foo.pstack | summarize-pstacks
cat foo_*.pstack | summarize-pstacks

Change-Id: I0d00f7cea5fe01ff8b2511f4e04db5d5ad1c82f4
Reviewed-on: http://gerrit.cloudera.org:8080/11926
Reviewed-by: Bharath Vissapragada <bhara...@cloudera.com>
Tested-by: Impala Public Jenkins <impala-public-jenk...@cloudera.com>
---
M bin/rat_exclude_files.txt
A bin/summarize-pstacks
2 files changed, 43 insertions(+), 0 deletions(-)

Approvals:
  Bharath Vissapragada: Looks good to me, approved
  Impala Public Jenkins: Verified

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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: merged
Gerrit-Change-Id: I0d00f7cea5fe01ff8b2511f4e04db5d5ad1c82f4
Gerrit-Change-Number: 11926
Gerrit-PatchSet: 4
Gerrit-Owner: Bharath Vissapragada <bhara...@cloudera.com>
Gerrit-Reviewer: Bharath Vissapragada <bhara...@cloudera.com>
Gerrit-Reviewer: Impala Public Jenkins <impala-public-jenk...@cloudera.com>
Gerrit-Reviewer: Tim Armstrong <tarmstr...@cloudera.com>

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