[Bug 1749261] [NEW] Add amd64/i386 support

[Steve Beattie]

Public bug reported:

To mitigate Spectre Variant 2, gcc needs to have retpoline support
(-mindirect-branch and -mfunction-return arguments on amd64 and i386).

Packages with this will go into the proposed pockets but need to be
published in the -security pockets for their respective releases.

** Affects: gcc-4.8 (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1749261

Title:
  Add amd64/i386 support

Status in gcc-4.8 package in Ubuntu:
  New

Bug description:
  To mitigate Spectre Variant 2, gcc needs to have retpoline support
  (-mindirect-branch and -mfunction-return arguments on amd64 and i386).

  Packages with this will go into the proposed pockets but need to be
  published in the -security pockets for their respective releases.

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