[FIR-TEST] Move analysis tests to separate module

compiler/fir/analysis-tests/testData/resolveWithStdlib/hashSet.kt

@@ -0,0 +1,20 @@
+import java.util.HashSet
+
+val a: MutableSet<String>? = HashSet()
+
+var b: MutableSet<String>? = null
+    set(_) {
+        field = HashSet()
+    }
+
+var <T> MutableSet<T>.d: T? get() = null
+    set(_) {}
+
+fun <T> produce(): T = TODO()
+
+fun foo() {
+    var c: MutableSet<String>? = null
+    c = HashSet()
+
+    c!!.d = produce()
+}