[FIR2IR] Properly handle callable references to static functions

compiler/testData/codegen/box/fir/callableReferenceToStaticFunction.kt

@@ -0,0 +1,12 @@
+// TARGET_BACKEND: JVM_IR
+// FULL_JDK
+// WITH_STDLIB
+
+import java.nio.file.Files
+import java.nio.file.Path
+
+fun test(path: Path): Path? {
+    return path.takeIf(Files::exists)
+}
+
+fun box() = "OK"