Use of space as a separator for options is problematic for wrapper
scripts (i.e. implementations of `%run`) that have to marshall
environment variables to target different than the host.
Rather than requiring every implementation of `%run` to support spaces
in `TSAN_OPTIONS` it is simpler to fix this single test case.
rdar://83637067
Differential Revision: https://reviews.llvm.org/D110967
The stress test does various assorted things
(memory accesses, function calls, atomic operations,
thread creation/join, intercepted libc calls)
in multiple threads just to stress various parts
of the runtime.
Reviewed By: melver
Differential Revision: https://reviews.llvm.org/D110416