[Bug dynamic-link/19762] New: HAS_CPU_FEATURE/HAS_ARCH_FEATURE are easy to misuse

["hjl.tools at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=19762

            Bug ID: 19762
           Summary: HAS_CPU_FEATURE/HAS_ARCH_FEATURE are easy to misuse
           Product: glibc
           Version: 2.23
            Status: NEW
          Severity: normal
          Priority: P2
         Component: dynamic-link
          Assignee: unassigned at sourceware dot org
          Reporter: hjl.tools at gmail dot com
  Target Milestone: ---

There are bits and indices into cpuid and feature arrays of
struct cpu_features.  It is very easy to use bits and indices
of cpuid on feature array, especially in assembly codes.  For
example, sysdeps/i386/i686/multiarch/bcopy.S has

        HAS_CPU_FEATURE (Fast_Rep_String)

which should be

        HAS_ARCH_FEATURE (Fast_Rep_String)

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