[Bug 1829851] [NEW] SRU: Update gcc-9 to the first GCC 9 release (9.1.0)

[Matthias Klose]

Public bug reported:

disco was released with an early GCC 9 version, not used as the default
compiler.  This SRU updates gcc-9 to the 9.1.0 release.  The changes
were present in eoan for a while, and no regressions were seen so far.
The changes should go to the security pocket, so that the toolchain
packages are available for security uploads as well.

gcc-9-cross and gcc-9-cross-ports are just rebuilds using the updated
gcc-9-source package.

Acceptance criteria: No regressions in the GCC 9 testsuite, and the
cross packages just build.

** Affects: gcc-9 (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: gcc-9-cross (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: gcc-9-cross-ports (Ubuntu)
     Importance: Undecided
         Status: New

** Also affects: gcc-9-cross (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: gcc-9-cross-ports (Ubuntu)
   Importance: Undecided
       Status: New

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Title:
  SRU: Update gcc-9 to the first GCC 9 release (9.1.0)

Status in gcc-9 package in Ubuntu:
  New
Status in gcc-9-cross package in Ubuntu:
  New
Status in gcc-9-cross-ports package in Ubuntu:
  New

Bug description:
  disco was released with an early GCC 9 version, not used as the
  default compiler.  This SRU updates gcc-9 to the 9.1.0 release.  The
  changes were present in eoan for a while, and no regressions were seen
  so far.  The changes should go to the security pocket, so that the
  toolchain packages are available for security uploads as well.

  gcc-9-cross and gcc-9-cross-ports are just rebuilds using the updated
  gcc-9-source package.

  Acceptance criteria: No regressions in the GCC 9 testsuite, and the
  cross packages just build.

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