[Bug 1821200] [NEW] Mark vx and vxe as important hwcap to be able to provide differently tuned shared libraries.

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Please pick the glibc commit "S390: Mark vx and vxe as important hwcap.". This commit is already cherry-picked to glibc 2.29 release branch: https://sourceware.org/git/?p=glibc.git;a=commit;h=6eb48fe80cb6dd3ef536e86d005976d1c22b170e.
Note: This commit is also cherry-picked to glibc 2.27, 2.28 release branches.

This commit allows to have a library (e.g. libatlas) with different
tunings, e.g. one with vx- and another one with vxe-instructions. With
this patch, glibc chooses the "best" available version depending on the
hwcaps reported by the kernel.

The correct locations for the different tuned libraries are:
-for z14 with vxe-support: /usr/lib/s390x-linux-gnu/vxe/
-for z13 with vx-support:  /usr/lib/s390x-linux-gnu/vx/
-for all without vector-support: /usr/lib/s390x-linux-gnu/

As information:
One could also place the libraries into z13 or z14 subfolders. But e.g. if you run on a z13 and vector support is disabled (e.g. by specified kernel-parameter), the "z13" library with vector instructions is chosen - which is NOT allowed!
 
Contact Information =   
 
---uname output---
 
 
Machine Type =   
 
---Steps to Reproduce---
 see "problem description"
 
Userspace tool common name: glibc 

Userspace rpm: libc6 
 
The userspace tool has the following bit modes: both 

Userspace tool obtained from project website:  na 
 
*Additional Instructions for  :
-Attach ltrace and strace of userspace application.

** Affects: glibc (Ubuntu)
     Importance: Undecided
     Assignee: Skipper Bug Screeners (skipper-screen-team)
         Status: New


** Tags: architecture-s39064 bugnameltc-176286 severity-medium targetmilestone-inin1904
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Mark vx and vxe as important hwcap to be able to provide differently tuned shared libraries.
https://bugs.launchpad.net/bugs/1821200
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