radeonsi: update fallthrough comments

Reviewed-by: Kristian H. Kristensen <hoegsberg@google.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7747>

src/gallium/drivers/radeonsi/si_buffer.c

@@ -111,7 +111,7 @@ void si_init_resource_fields(struct si_screen *sscreen, struct si_resource *res,
    switch (res->b.b.usage) {
    case PIPE_USAGE_STREAM:
       res->flags = RADEON_FLAG_GTT_WC;
-      /* fall through */
+      FALLTHROUGH;
    case PIPE_USAGE_STAGING:
       /* Transfers are likely to occur more often with these
        * resources. */
@@ -126,7 +126,7 @@ void si_init_resource_fields(struct si_screen *sscreen, struct si_resource *res,
          res->flags |= RADEON_FLAG_GTT_WC;
          break;
       }
-      /* fall through */
+      FALLTHROUGH;
    case PIPE_USAGE_DEFAULT:
    case PIPE_USAGE_IMMUTABLE:
    default:

src/gallium/drivers/radeonsi/si_query.c

@@ -928,7 +928,7 @@ static void si_query_hw_do_emit_stop(struct si_context *sctx, struct si_query_hw
       break;
    case PIPE_QUERY_TIME_ELAPSED:
       va += 8;
-      /* fall through */
+      FALLTHROUGH;
    case PIPE_QUERY_TIMESTAMP:
       si_cp_release_mem(sctx, cs, V_028A90_BOTTOM_OF_PIPE_TS, 0, EOP_DST_SEL_MEM, EOP_INT_SEL_NONE,
                         EOP_DATA_SEL_TIMESTAMP, NULL, va, 0, query->b.type);
@@ -1223,7 +1223,7 @@ static void si_get_hw_query_params(struct si_context *sctx, struct si_query_hw *
    case PIPE_QUERY_SO_OVERFLOW_ANY_PREDICATE:
       params->pair_count = SI_MAX_STREAMS;
       params->pair_stride = 32;
-      /* fallthrough */
+      FALLTHROUGH;
    case PIPE_QUERY_SO_OVERFLOW_PREDICATE:
       params->start_offset = 0;
       params->end_offset = 16;

src/gallium/drivers/radeonsi/si_shader_llvm_vs.c

@@ -277,7 +277,7 @@ void si_llvm_streamout_store_output(struct si_shader_context *ctx, LLVMValueRef
       }
       /* as v4i32 (aligned to 4) */
       out[3] = LLVMGetUndef(ctx->ac.i32);
-      /* fall through */
+      FALLTHROUGH;
    case 4: /* as v4i32 */
       vdata = ac_build_gather_values(&ctx->ac, out, util_next_power_of_two(num_comps));
       break;