[sanitizers] Fix check failure on dealloc from new thread

Summary:
Adds a test for this case, which was reduced from a chromium build of
WebKit's DumpRenderTree.

Reviewers: eugenis

CC: glider

Differential Revision: http://llvm-reviews.chandlerc.com/D495

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@176552 91177308-0d34-0410-b5e6-96231b3b80d8