Bug ID: 31225
           Summary: X86 - adding "hasNopl()" as subtarget feature
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: X86
    Classification: Unclassified

some CPUs don't support long nop.
lib/Target/X86/MCTargetDesc/X86AsmBackend.cpp contain big condition with string
compares over all the CPUs that don't support nopl (HasNopl), it can be
replaced with new subtarget feature.

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