[Bug 1750893] [NEW] Enable x86 retpoline options by default

[Steve Beattie]

Public bug reported:

For Ubuntu 18.04 LTS, the x86 retpoline options (-mindirect-branch=thunk
and -mfunction-return=thunk) should be enabled by default.

For problematic packages, -mindirect-branch=keep and -mfunction-
return=keep can be used to disable retpolines.

** Affects: gcc-7 (Ubuntu)
     Importance: Undecided
         Status: New

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Title:
  Enable x86 retpoline options by default

Status in gcc-7 package in Ubuntu:
  New

Bug description:
  For Ubuntu 18.04 LTS, the x86 retpoline options (-mindirect-
  branch=thunk and -mfunction-return=thunk) should be enabled by
  default.

  For problematic packages, -mindirect-branch=keep and -mfunction-
  return=keep can be used to disable retpolines.

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