Parse current llama timing output in ubatch bench

scripts/bench-ubatch-rocmi4.sh

@@ -192,10 +192,12 @@ def grab(arr):
 
 g_tps = ""
 if evals and ct:
-    # eval time line: "eval time = .. ms for N tokens"
-    ev = evals[-1].split("= ")[-1]
-    ms = float(ev.split(" for")[0].strip())
-    g_tps = f"{ct / (ms / 1000):.2f}"
+    # eval timing line: "eval time = .. ms / N tokens (... tokens per second)"
+    import re
+    match = re.search(r"eval time =\\s*([0-9.]+) ms", evals[-1])
+    if match:
+        ms = float(match.group(1))
+        g_tps = f"{ct / (ms / 1000):.2f}"
 print(f"== RESULT ubatch={ubatch} run={r} "
       f"PREFILL={grab(prefill)} GEN_TPS={g_tps} "
       f"pt={pt} ct={ct} wall={dt:.1f}s")