[Patch] GCN: Add pre-initial support for gfx1100

[Tobias Burnus]

ROCm meanwhile supports also some consumer cards; besides the semi-new 
gfx1030, support for gfx1100 was added more recently (in ROCm 5.7.1 for 
"Ubuntu 22.04 only" and without parenthesis since ROCm 6.0.0).

GCC has already very limited support for gfx1030 - whose multlib support 
is - on purpose - not yet enabled by default and is WIP.

The attached patch now adds gfx1100 on top of it, assuming that it 
mostly behaves the same as gfx1030. This is really WIP as there are 
known build (assembly) issues (see below) and not only "just" runtime 
issues.

gfx1100 differs at least in the following aspects from the previously 
supported cards:

* gfx1100 has an 'architected flat scratch' which is different from 
'absolute flat scratch' which all others (but fiji: 'offset flat 
scratch') have. Hence, '.amdhsa_reserve_flat_scratch 0'
has to be excluded to avoid assembly errors.

* gfx1100 also does not support 'v_mov_b32_sdwa', failing to assembly
   libc/argz/libc_a-argz_stringify.o with:
   "sdwa variant of this instruction is not supported"
→ This has not been address in the patch, hence, specifying gfx1100 in 
--with-multilib-list= will fail to build when an in-tree newlib is build.

* * *

The attached patch fixes in addition one issue in libgomp (string-length 
len constant is too short for gfx1030 (and gfx1100) = 7 characters) and 
it includes the fix that __gfx1030__ is not defined, which I have 
submitted separately (yesterday).

With the caveat that gfx1100 is even less usable than gfx1030 and it 
won't build newlib, is it nonetheless

   OK for mainline ?

(As gfx1100 is not enabled by default in multilib, a regular build will 
will not fail and I think the *.md issue can be addressed separately.)

Tobias
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