[SR-2141] TestThreadExit.py failing on Ubuntu, master-next

[trfiala]

Previous ID	SR-2141
Radar	rdar://problem/27471504
Original Reporter	@trfiala
Type	Bug

Environment

Ubuntu 16.04 x86_64, clang-3.6.2-1, swift-lldb/master-next

Additional Detail from JIRA

Votes	0
Component/s	LLDB for Swift
Labels	Bug, Linux
Assignee	None
Priority	Medium

md5: fb99904c01ff13e8771bf9fbf8221689

Issue Description:

This test started failing on Ubuntu 16.04 after merging in swift-lldb/master and swift-lldb/upstream into swift-lldb/master-next.

[trfiala]

I xfailed the test here:

commit 04998abc89b484f79bc5390cc48eb66a4cbebcad
Author: Todd Fiala <todd.fiala@gmail.com>
Date: Thu Jul 21 09:17:34 2016 -0600

xfailed TestRegisterVariables.py and TestThreadExit on Linux

bugs.swift.org/SR-2140
bugs.swift.org/SR-2141