[Bug 1638055] [NEW] redundant swaps when using vec_vsx_ld/st

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Public bug reported:

---Problem Description---
Please pick up r239762 from the FSF gcc-5-branch as a bug fix for upstream bug PR72863.  In the best case, the unfixed compiler will produce inefficient code, but it can also cause incorrect code to be generated at high optimization levels.  The testcase in the upstream bugzilla can be used to verify the fix.
  
---Steps to Reproduce---
 See testcase in https://gcc.gnu.org/bugzilla/show_bug.cgi?id=72863

** Affects: gcc-4.4 (Ubuntu)
     Importance: Undecided
     Assignee: Taco Screen team (taco-screen-team)
         Status: New


** Tags: architecture-ppc64le bugnameltc-148017 severity-medium targetmilestone-inin16041

** Tags added: architecture-ppc64le bugnameltc-148017 severity-medium
targetmilestone-inin16041

** Changed in: ubuntu
     Assignee: (unassigned) => Taco Screen team (taco-screen-team)

** Package changed: ubuntu => gcc-4.4 (Ubuntu)

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https://bugs.launchpad.net/bugs/1638055

Title:
  redundant swaps when using vec_vsx_ld/st

Status in gcc-4.4 package in Ubuntu:
  New

Bug description:
  ---Problem Description---
  Please pick up r239762 from the FSF gcc-5-branch as a bug fix for upstream bug PR72863.  In the best case, the unfixed compiler will produce inefficient code, but it can also cause incorrect code to be generated at high optimization levels.  The testcase in the upstream bugzilla can be used to verify the fix.
    
  ---Steps to Reproduce---
   See testcase in https://gcc.gnu.org/bugzilla/show_bug.cgi?id=72863

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