[ELF] - Revert r311310 "[ELF] - Do not forget to fill last bytes of PT_LOADs...

[ELF] - Revert r311310 "[ELF] - Do not forget to fill last bytes of PT_LOADs with trap instructions."

It broke BB:
http://lab.llvm.org:8011/builders/lld-x86_64-darwin13/builds/11792/steps/test_lld/logs/stdio

llvm-svn: 311314