Fix precedence bugs, test on homework

Project-02-03/tramcodes/homework.tram

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+  GOTO L1
+L2: NOP
+  LOAD 0 0
+  CONST 0
+  EQ
+  IFZERO L4
+  GOTO L6
+L7: NOP
+  LOAD 0 0
+  LOAD 1 1
+  MUL
+  LOAD 1 0
+  ADD
+  RETURN
+L6: NOP
+  CONST 2
+  LOAD 1 0
+  MUL
+  LOAD 0 0
+  INVOKE 2 L7 0
+  GOTO L5
+L4: NOP
+  LOAD 0 0
+  CONST 1
+  ADD
+L5: NOP
+  RETURN
+L3: NOP
+  LOAD 1 0
+  CONST 0
+  GT
+  IFZERO L9
+  GOTO L11
+L8: NOP
+  LOAD 1 0
+  CONST 0
+  GT
+  IFZERO L10
+  POP
+L11: NOP
+  LOAD 0 0
+  LOAD 0 0
+  LOAD 1 0
+  INVOKE 2 L2 1
+  MUL
+  STORE 0 0
+  LOAD 0 0
+  POP
+  LOAD 1 0
+  CONST 1
+  SUB
+  STORE 1 0
+  LOAD 1 0
+  GOTO L8
+L9: NOP
+  CONST None
+L10: NOP
+  POP
+  LOAD 0 0
+  CONST 42
+  ADD
+  RETURN
+L1: NOP
+  CONST 1
+  CONST 2
+  INVOKE 2 L2 0
+  POP
+  CONST 3
+  CONST 3
+  INVOKE 2 L3 0
+  HALT