[Bug dynamic-link/20547] New: Don't use AT_HWCAP for shared library search path

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

https://sourceware.org/bugzilla/show_bug.cgi?id=20547

            Bug ID: 20547
           Summary: Don't use AT_HWCAP for shared library search path
           Product: glibc
           Version: 2.25
            Status: NEW
          Severity: normal
          Priority: P2
         Component: dynamic-link
          Assignee: unassigned at sourceware dot org
          Reporter: hjl.tools at gmail dot com
  Target Milestone: ---
            Target: x86

AT_HWCAP is treated differently on i386:

AT_HWCAP:    fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat
pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe

vs x86-64:

AT_HWCAP:        bfebfbff

as shown by LD_SHOW_AUXV. On i386, only sse2 is used for shared library search
path.  On x86-64, nothing additional directory is searched for shared library.
We can use _dl_x86_cpu_features to replace AT_HWCAP and enable additional
directories for loading shared libraries.

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