Update sysir to have better field support.

examples/sysdialect_asm.janet

@@ -10,12 +10,15 @@
      (bind 3 1)
      (bind 4 1)
      (bind 5 1)
+     (bind 6 2)
      (constant 0 10)
      (constant 0 21)
      (add 2 1 0)
      (constant 3 1.77)
      (call 3 sin 3)
      (cast 4 2)
+     (fset 2 6 0)
+     (fset 3 6 1)
      (add 5 4 3)
      (return 5))
    :parameter-count 0