FIR: Temporary support FE 1.0 behavior for SAM vs. generic ambiguity

^KT-48300 Relates
^KT-48938 Fixed

compiler/testData/diagnostics/tests/samConversions/samPriorityVsGenericCompatibilityDisabled.kt

@@ -0,0 +1,14 @@
+// !LANGUAGE: +DisableCompatibilityModeForNewInference
+// SKIP_TXT
+// FIR_IDENTICAL
+// FULL_JDK
+
+fun <T> bar(action: () -> T): T = action()
+fun bar(action: java.lang.Runnable) { }
+
+fun foo(): String = ""
+
+fun main() {
+    val x = bar() { foo() } // OK with default current 1.5/1.6, Error with DisableCompatibilityModeForNewInference enabled
+    x.<!UNRESOLVED_REFERENCE!>length<!>
+}