Debian: gcc: add support for ARC

[Vineet Gupta <Vineet.Gupta1@synopsys.com>]

Source: gcc
Severity: normal
Tags: patch

Hi,

To bootstrap arc port we need following changes to debian:gcc.
These patches are based off of 10.2.1-6 as that's what rebootstrap 
builds are using.

- 0001-ARC-upstream-gcc-driver-default-to-hard-float.patch
     This change is already merged in mainline gcc as of 2021-06-02
     commit 46d04271a498 "ARC: gcc driver default to hs38_linux"

- 0002-ARC-debian-rules2-gcc-disable-multilib.patch

- 0003-ARC-debian-gcc-defines-for-multilib-multiarch-enabli.patch
     This is equivalent of following for arc
      - debian/patches/gcc-multiarch.diff
      - debian/patches/gcc-multilib-multiarch.diff

- 0004-ARC-debian-gcc-add-build-toogles-as-for-other-arches.patch
     This is equivalent of following for arc
     - debian/patches/gcc-hash-style-gnu.diff
     - debian/patches/gcc-as-needed.diff


Thx,
-Vineet