agx: tweak jmp_exec_none heuristic

to make sure border colour code is skipped.

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/30633>

src/asahi/compiler/agx_opt_jmp_none.c

@@ -32,9 +32,10 @@ cost_instr(agx_instr *I)
    /* TODO: Better heuristic */
    switch (I->op) {
    case AGX_OPCODE_DEVICE_LOAD:
+      return 10;
    case AGX_OPCODE_TEXTURE_LOAD:
    case AGX_OPCODE_TEXTURE_SAMPLE:
-      return 10;
+      return 50;
    default:
       return 1;
    }