Improve JIT diagnostic logging for CI visibility

This upgrades code_cache_flush logging from DEBUG to INFO level to make
this critical event visible in CI test logs.

Author: jserv

src/jit.c

@@ -2168,9 +2168,8 @@ void clear_hot(block_t *block)
 
 static void code_cache_flush(struct jit_state *state, riscv_t *rv)
 {
-    rv_log_debug(
-        "JIT: Flushing code cache (n_blocks=%d, n_jumps=%d, offset=%u)",
-        state->n_blocks, state->n_jumps, state->offset);
+    rv_log_info("JIT: Flushing code cache (n_blocks=%d, n_jumps=%d, offset=%u)",
+                state->n_blocks, state->n_jumps, state->offset);
     should_flush = false;
     state->offset = state->org_size;
     state->n_blocks = 0;