[Bug 2049493] ARM builds

[Nathan Teodosio]

ARMv8 built alright with your proposed RUSTC_BOOTSTRAP strategy.

I still do not understand why manually removing the -Z flags failed. 
Could it be that those undefined references were to unstable functions? 
But that is just out of curiosity.

For the purposes of this report, please kindly continue with the Jammy 
backport of Rustc 1.7.1 as it solves the issue at hand.

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https://bugs.launchpad.net/bugs/2049493

Title:
  Newer rustc version needed in jammy to build chromium updates

Status in chromium-browser package in Ubuntu:
  New
Status in rustc package in Ubuntu:
  New

Bug description:
  The next chromium version is making rustc mandatory to build. Chromium
  is a snap built from core22 so using the jammy packages, the build is
  currently failing because it needs libprofiler_builtins.rlib which
  isn't available.

  Upstream provides toolchain builds that can be used but only for amd64 so currently the snap is failing to build on arm
  https://launchpad.net/~chromium-team/+snap/chromium-snap-from-source-beta

  The version upstream is using is 1.75 but it's possible that a lower
  version would be enough for now if libprofiler was enabled

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