Revert part of r321026 "[X86] Don't use NOPL when the assembler is passed an empty CPU string." while I investigate how to fix an lld test failure.

Looks like lld also needs to pass a -mcpu in some of its tests

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@321033 91177308-0d34-0410-b5e6-96231b3b80d8
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