[FIR-TEST] Move analysis tests to separate module

compiler/fir/analysis-tests/testData/resolveWithStdlib/j+k/MapCompute.kt

@@ -0,0 +1,11 @@
+// FULL_JDK
+// STDLIB_JDK8
+// !JVM_TARGET: 1.8
+
+fun <D> MutableMap<String, MutableSet<D>>.initAndAdd(key: String, value: D) {
+    this.compute(key) { _, maybeValues ->
+        val setOfValues = maybeValues ?: mutableSetOf()
+        setOfValues.add(value)
+        setOfValues
+    }
+}