Add tests for converting expressions of function types to suspending functional types

compiler/testData/codegen/box/suspendConversion/chainedFunSuspendConversionForSimpleExpression.kt

@@ -0,0 +1,19 @@
+// FIR_IDENTICAL
+// !LANGUAGE: +SuspendConversion
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+
+fun interface SuspendRunnable {
+    suspend fun invoke()
+}
+
+fun foo(s: SuspendRunnable) {}
+
+fun test(f: () -> Unit) {
+    foo { }
+    foo(f)
+}
+
+fun box(): String {
+    test({ "" })
+    return "OK"
+}