test_debuginfo.pl: Make failures easier to debug by printing the debugger
output.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201809 91177308-0d34-0410-b5e6-96231b3b80d8
[Support] Correctly handle zero length inputs to UTF conversion functions on Windows.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201811 91177308-0d34-0410-b5e6-96231b3b80d8