nir: Drop "SSA" from NIR language

Everything is SSA now.

   sed -e 's/nir_ssa_def/nir_def/g' \
       -e 's/nir_ssa_undef/nir_undef/g' \
       -e 's/nir_ssa_scalar/nir_scalar/g' \
       -e 's/nir_src_rewrite_ssa/nir_src_rewrite/g' \
       -e 's/nir_gather_ssa_types/nir_gather_types/g' \
       -i $(git grep -l nir | grep -v relnotes)

   git mv src/compiler/nir/nir_gather_ssa_types.c \
          src/compiler/nir/nir_gather_types.c

   ninja -C build/ clang-format
   cd src/compiler/nir && find *.c *.h -type f -exec clang-format -i \{} \;

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Acked-by: Faith Ekstrand <faith.ekstrand@collabora.com>
Acked-by: Emma Anholt <emma@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/24585>

src/asahi/compiler/agx_compiler.h

@@ -454,7 +454,7 @@ agx_size_for_bits(unsigned bits)
 }
 
 static inline agx_index
-agx_nir_ssa_index(nir_ssa_def *ssa)
+agx_nir_ssa_index(nir_def *ssa)
 {
    return agx_get_index(ssa->index, agx_size_for_bits(ssa->bit_size));
 }