freedreno/ir3: 'keeps' need neighbors found too

This shows up with a glamor shader, which does a TXF and uses the result
for conditional kill.  Before we wouldn't group the fanin (collect)
neighbors which need to be allocated adjacently at RA, resulting in
badness.

Signed-off-by: Rob Clark <robclark@freedesktop.org>

src/gallium/drivers/freedreno/ir3/ir3_group.c

@@ -236,6 +236,11 @@ find_neighbors(struct ir3 *ir)
 			instr_find_neighbors(instr);
 		}
 	}
+
+	for (i = 0; i < ir->keeps_count; i++) {
+		struct ir3_instruction *instr = ir->keeps[i];
+		instr_find_neighbors(instr);
+	}
 }
 
 void