[LLD][ELF] - Add a test for non-null terminated mergeable strings section. NFCI.
[LLD][ELF] - Add a test for non-null terminated mergeable strings section. NFCI.

LLD reports an error in this case, but we had no test.

git-svn-id: f6089bf0e6284f307027cef4f64114ee9ebb0424@347535 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/lld,llvm-mirror/lld