c-index-test: Run inside a separate thread iff we have pthread support, to
ensure we at least get some minimal testing of running in a multithreaded
environment (for example, having a reduced stack size).

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@115200 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed