Fix DWARF for 0-length CIE (data after the length should not be read if length is 0).

git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@189191 91177308-0d34-0410-b5e6-96231b3b80d8
PECOFF: Add support for export table.

git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@189192 91177308-0d34-0410-b5e6-96231b3b80d8