Support passing positional args as keywords to bytecode functions.

For this, record argument names along with each bytecode function. The code
still includes extensive debug logging support so far.

tests/basics/fun-kwargs.py

@@ -0,0 +1,35 @@
+def f1(a):
+    print(a)
+
+f1(123)
+f1(a=123)
+try:
+    f1(b=123)
+except TypeError:
+    print("TypeError")
+
+def f2(a, b):
+    print(a, b)
+
+f2(1, 2)
+f2(a=3, b=4)
+f2(b=5, a=6)
+f2(7, b=8)
+try:
+    f2(9, a=10)
+except TypeError:
+    print("TypeError")
+
+def f3(a, b, *args):
+    print(a, b, args)
+
+
+f3(1, b=3)
+try:
+    f3(1, a=3)
+except TypeError:
+    print("TypeError")
+try:
+    f3(1, 2, 3, 4, a=5)
+except TypeError:
+    print("TypeError")