llvm dev - Nov 2020 - Looking for a reviewer for two simple clang fixes

Hello!

I have two pending fixes for clang on Sparc on Linux. These are:
> https://reviews.llvm.org/D90524
> https://reviews.llvm.org/D90549
Basically, the first change adds a multilib workaround for 32-bit
Sparc on 64-bit Sparc that's already being used on X86 and PPC.

It fixes the various "FAIL: Builtins-sparc-linux" failures in the
testsuite [1]:
> Command Output (stderr):
> --
> /usr/bin/ld: cannot find crt1.o: No such file or directory
> /usr/bin/ld: cannot find crti.o: No such file or directory
> /usr/bin/ld: skipping incompatible /usr/lib/sparc64-linux-gnu/libc.so when
searching for -lc
> /usr/bin/ld: skipping incompatible /usr/lib/sparc64-linux-gnu/libc.a when
searching for -lc
> /usr/bin/ld: cannot find -lc
> /usr/bin/ld: skipping incompatible /usr/lib/sparc64-linux-gnu/libc.so when
searching for -lc
> /usr/bin/ld: skipping incompatible /usr/lib/sparc64-linux-gnu/libm.so when
searching for -lm
> /usr/bin/ld: skipping incompatible /usr/lib/sparc64-linux-gnu/libm.a when
searching for -lm
> /usr/bin/ld: cannot find -lm
> /usr/bin/ld: skipping incompatible /usr/lib/sparc64-linux-gnu/libm.so when
searching for -lm
> /usr/bin/ld: cannot find crtn.o: No such file or directory
> clang-12: error: linker command failed with exit code 1 (use -v to see
invocation)
The second change is necessary as the first fix causes the CHECK-DEBIAN-SPARC*
tests to fail. The second change switches these tests to modern Debian MultiArch
folders as it is already being used for other architectures on Debian such as
PowerPC
and x86.

Could someone review those small changes for me and commit them? I have not been
able to find a reviewer yet.

Thanks,
Adrian
> [1] http://lab.llvm.org:8014/#/builders/134/builds/41
-- 
 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer - glaubitz at debian.org
`. `'   Freie Universitaet Berlin - glaubitz at physik.fu-berlin.de
  `-    GPG: 62FF 8A75 84E0 2956 9546  0006 7426 3B37 F5B5 F913