[LTO] Add datalayout to test to prevent an assertion in Debug mode.
[LTO] Add datalayout to test to prevent an assertion in Debug mode.

While here, run this test only on x86.

git-svn-id: f6089bf0e6284f307027cef4f64114ee9ebb0424@266487 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/lld,llvm-mirror/lld