This patch is mostly motivated by distribution needs in general
and Debian/Ubuntu needs in particular – but I think it makes
sense for all GCC 11 users.

GCC's AMD GCN support uses LLVM's assembler and linker mc/lld
and thus requires compatibility with LLVM. On mainline, support
for LLVM 13 was added – and I like to see a backport to GCC 11.

In particular, I would like to "git cherry-pick -x' the following patches:

cfa1f8226f2 gcc/configure.ac: fix register issue for global_load assembler functions
aad32a00b7d amdgcn: Add -mxnack and -msram-ecc [PR 100208]
5c127c4cac3 amdgcn: Mark s_mulk_i32 as clobbering SCC
  (Outside of this series as it only picks a bug fix)
6ca03ca35a5 amdgcn: Support LLVM 13 assembler syntax
  (-> see remark below)
205dafb6ede amdgcn: Implement -msram-ecc=any
81c362c7c2b amdgcn: Fix assembler version incompatibility
f3d64372d77 amdgcn: fix up offload debug linking with LLVM 13

OK for GCC 11?

[I have build GCC x86-64 with amdgcn offloading enabled both
with LLVM 9 and with LLVM 13; libgomp passes fine with LLVM 9
but with the LLVM 13 build, I see an ICE in lld for some testcases,
which I have not debugged – but GCC itself builds and several
libgomp testcases do pass.]

Tobias

PS: I attached
* the full "git log --stat" for all those patches for references
* as the 4th one, "Support LLVM 13 assembler syntax", does not
   cleanly apply, I attached the full patch.

The reason that the latter does not apply is that mainline changed:
"configure: remove version argument from gcc_GAS_CHECK_FEATURE"
in https://gcc.gnu.org/g:e0b6d0b39c69372e4a66f44d218e0244bb549d83
which was fixed for GCN a bit later in commit
"configure: Adjust several assembler checks to remove an unused parm."
https://gcc.gnu.org/g:e5d9873fcb6f90d03b7534af53de39ec65d0cdc5

The only change is "," to ",," in configure.ac; 'configure' itself
was already fine.
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