Move a debug info test into the X86 directory

This test triggers a code path which does not appear to fire on some
targets:

http://lab.llvm.org:8011/builders/clang-cmake-armv8-quick/builds/3028

I've made the test X86-specific in an attempt to address the issue.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@333138 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed