[Bug 1888654] [NEW] [UBUNTU 20.10] Accept vector alignment hints on z13 (binutils)

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On z13 we have that vector alignment hints are already accepted. This
backport enables GAS to accept such hints not only for target z14 but
also for z13. Since GCCs default target on Ubuntu is z13 for s390x, we
could greatly benefit from such alignment hints. (note a separate
bugzilla entry for GCC allowing to emit alignment hints for z13 will be
opened shortly)

This is a backport of upstreams commit 26b6ab7a0e.
 
---Additional Hardware Info---
n/a 

 
---uname output---
n/a
 
---Debugger Data---
n/a 
 
Machine Type = z13 2964 
 
---Steps to Reproduce---
 n/a
 
Userspace tool common name: as 
 
The userspace tool has the following bit modes: 64-bit 

Userspace rpm: binutils

Userspace tool obtained from project website:  na

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


** Tags: architecture-s39064 bugnameltc-187057 severity-medium targetmilestone-inin2010
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[UBUNTU 20.10] Accept vector alignment hints on z13 (binutils)
https://bugs.launchpad.net/bugs/1888654
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