[FIR-TEST] Move analysis tests to separate module

compiler/fir/analysis-tests/testData/resolve/smartcasts/safeCalls/assignSafeCall.kt

@@ -0,0 +1,60 @@
+// !DUMP_CFG
+// ----------------- Stable -----------------
+
+class A {
+    fun foo(): Int = 1
+
+    val x: Int = 1
+
+    fun bar() {}
+}
+
+fun test_1(a: A?) {
+    val x = a?.x
+    if (x != null) {
+        a.bar() // Should be OK
+    }
+}
+
+fun test_2(a: A?) {
+    val x = a?.foo()
+    if (x != null) {
+        a.bar() // Should be OK
+    }
+}
+
+fun test_3(x: Any?) {
+    val a = x as? A ?: return
+    a.foo() // Should be OK
+    x.foo() // Should be OK
+}
+
+// ----------------- Unstable -----------------
+
+interface B {
+    fun foo(): Int
+
+    val x: Int
+
+    fun bar()
+}
+
+fun test_1(a: B?) {
+    val x = a?.x
+    if (x != null) {
+        a.bar() // Should be OK
+    }
+}
+
+fun test_2(a: B?) {
+    val x = a?.foo()
+    if (x != null) {
+        a.bar() // Should be OK
+    }
+}
+
+fun test_3(x: Any?) {
+    val a = x as? B ?: return
+    a.foo() // Should be OK
+    x.foo() // Should be OK
+}