[FIR-TEST] Move analysis tests to separate module

compiler/fir/analysis-tests/testData/resolve/whenAsReceiver.kt

@@ -0,0 +1,12 @@
+fun <T, R> T.also(block: () -> R): R {
+    return null!!
+}
+
+fun foo(b: Boolean, a: Int) {
+    val x = when (b) {
+        true -> a
+        else -> null
+    }?.also {
+        1
+    }
+}