[ELF][AArch64] Improve some aarch64-*.s tests

* Delete aarch64-tls-static.s: it is covered by aarch64-tlsdesc.c
* Add --no-show-raw-insn to llvm-objdump -d tests
* When linking an executable with %t.so, the path %t.so will be recorded in the DT_NEEDED entry if %t.so doesn't have DT_SONAME. The DT_NEEDED has varying lengths on different systems.
  Add -soname to make tests more robust. This issue will become outstanding if we allow overlapping PT_LOAD (D64930).

llvm-svn: 366532