refactor: 重构死循环测试用例

- 将 initializer 改为 init
- 将 condition 改为 cond
- 将 update 改为 step

lib/math/factorial/factorial.snow

@@ -15,11 +15,11 @@ module: Math
         body:
             declare num1:int = 1
             loop:
-                initializer:
+                init:
                     declare counter:int = 1
-                condition:
+                cond:
                     counter <= n
-                update:
+                step:
                     counter = counter + 1
                 body:
                     num1 = num1 * counter

lib/test/Dead_loop.snow

@@ -3,11 +3,11 @@ function: main
     return_type: int
     body:
         loop:
-            initializer:
+            init:
                 declare i:int = 0
-            condition:
+            cond:
                 1 == 1
-            update:
+            step:
                 i = i + 1
             body:
 

playground/Demo/Demo5/Main.snow

@@ -5,11 +5,11 @@ module: Main
         body:
             declare b1: boolean = true
             loop:
-                initializer:
+                init:
                     declare i:int = 0
-                condition:
+                cond:
                     b1
-                update:
+                step:
                     i = i + 1
                 body:
 

playground/Demo/Demo9/Main.snow

@@ -15,11 +15,11 @@ module: Math
         body:
             declare num1:int = 1
             loop:
-                initializer:
+                init:
                     declare counter:int = 1
-                condition:
+                cond:
                     counter <= n
-                update:
+                step:
                     counter = counter + 1
                 body:
                     num1 = num1 * counter