Fix BB after r354319 "[yaml2obj] - Do not skip zeroes blocks if there are...

Fix BB after r354319 "[yaml2obj] - Do not skip zeroes blocks if there are relocations against them."

Fix: move the test to x86 folder. 
Seems it is needed, because llvm-objdump invocation used in test has -D (disasm) flag.

BB: http://lab.llvm.org:8011/builders/clang-hexagon-elf/builds/23016

/local/buildbot/slaves/hexagon-build-02/clang-hexagon-elf/stage1/bin/llvm-objdump: 
error: '/local/buildbot/slaves/hexagon-build-02/clang-hexagon-elf/stage1/test/tools/llvm-objdump/Output/disasm-zeroes-relocations.test.tmp': 
can't find target: : error: unable to get target for 'x86_64--', see --version and --triple.
.

llvm-svn: 354322