Fix a null pointer dereference in llvm-pdbutil pretty.

Static data members were causing a problem because I mistakenly
assumed all members would affect a class's layout and so the
Layout member would be non-null.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@305229 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed