[CI] Add immutable test

Author: eee4017

test/yul/immutable.yul

@@ -0,0 +1,28 @@
+// RUN: %soll --lang=Yul %s
+object "a" {
+    code {
+        setimmutable(
+            10,
+            "imm2",
+            address()
+        )
+        let memPtr := mload(64)
+        codecopy(memPtr, dataoffset("Test_deployed"), datasize("Test_deployed"))
+        setimmutable(
+            200,
+            "imm1",
+            address()
+        )
+        return(memPtr, datasize("Test_deployed"))
+    }
+    object "Test_deployed" {
+        code {
+            let addr := loadimmutable("imm1")
+            return(addr, 20)
+            function fun() -> temp {
+                let temp2 := loadimmutable("imm2")
+                temp := loadimmutable("imm1")
+            }
+        }
+    }
+}