r600/sfn/tests: Update source pinning when loading from string

Results of TEX and FETCH are pinned to group automatically when
creating instructions from string. With the new scheduling code
the channel pinning might be added and this needs to be handled
when reading the expectation shaders.

Signed-off-by: Gert Wollny <gert.wollny@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/36921>

src/gallium/drivers/r600/sfn/sfn_valuefactory.cpp

@@ -778,6 +778,13 @@ ValueFactory::src_from_string(const std::string& s)
          }
          return array->element(offset, addr, chan - array->frac());
       } else {
+         auto old_pin = ireg->second->pin();
+         if (old_pin != p) {
+            if ((old_pin == pin_group && p == pin_chgr) ||
+                ((old_pin == pin_free || old_pin == pin_none) &&
+                 (p == pin_chan || p == pin_group)))
+               ireg->second->set_pin(p);
+         }
          return ireg->second;
       }
    } else {