[LLD] add test for line number info related to differrent .text sections

   There is a bug for llvm-objdump which incorrectly reported line number
   info for object file if several .text sections presented.
   https://bugs.llvm.org/show_bug.cgi?id=40703 .
   This patch adds test for the same situation.

   Differential revision: https://reviews.llvm.org/D58357

llvm-svn: 355306