[ELF][test] Reorganize some R_*_NONE tests

Change R_{386,AARCH64}_NONE yaml2obj tests/icf10.test to use assembly

Add relocation-none-{arm,x86_64}.s.
  Check the referenced section survives under --gc-sections.
  Check -r copies R_X86_64_NONE R_AARCH64_NONE. (Elf*_Rel arches currently have a bug)
  Delete the dtrace tests as they are covered by the R_X86_64_NONE test.

Reviewed By: ruiu

Differential Revision: https://reviews.llvm.org/D62051

llvm-svn: 361013