test: 添加整数溢出测试用例

playground/BugFarm/Bug3/Main.snow

@@ -0,0 +1,19 @@
+module: Main
+    import: os
+    function: main
+        return_type: void
+        body:
+            // 合法
+            declare b1: byte = 127b
+            declare s1: short = 32767s
+            declare i1: int = 2147483647
+            declare l1: long = 9223372036854775807L
+
+            // 溢出（都应该收集到错误）
+            declare b2: byte = 128b
+            declare s2: short = 40000s
+            declare i2: int = 3000000000
+            declare l2: long = 9223372036854775808L
+        end body
+    end function
+end module

playground/BugFarm/Bug3/OS.snow

@@ -0,0 +1,11 @@
+module: os
+    import: os
+    function: print
+        parameter:
+            declare i1: int
+        return_type: void
+        body:
+            syscall("PRINT",i1)
+        end body
+    end function
+end module