Support irq packing in analyzation

analyze/config.py

@@ -2,6 +2,7 @@ markers = {
   "default": ".",
   "kernel_polling": "+",
   "manual_polling": "x",
+  "irq_packing": "*",
   "fstack": "s",
   "caladan": "p",
   "caladan (per-thread QPS w/ 2 threads)": "p"
@@ -11,6 +12,7 @@ colors = {
   "default": "tab:blue",
   "kernel_polling": "tab:orange",
   "manual_polling": "tab:purple",
+  "irq_packing": "tab:olive",
   "fstack": "tab:green",
   "caladan": "tab:red",
   "caladan (per-thread QPS w/ 2 threads)": "tab:red"