[lit] Fix a bug where UNRESOLVED tests were not handled in the XUnit
XML printer.

A test has been added that tries to comprehensively test emitting
XUnit XML output for shell tests.

Differential Revision: https://reviews.llvm.org/D45567

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@330409 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed