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

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

@@ -0,0 +1,17 @@
+// FIR_IDENTICAL
+// !LANGUAGE: +SuspendConversion
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+
+fun foo(f: () -> String, g: suspend () -> String, h: suspend () -> String) {}
+
+fun test(f: () -> String, g: suspend () -> String) {
+    foo(f, f, f)
+    foo(f, { "str" }, f)
+    foo(f, f, g)
+    foo(f, g, g)
+}
+
+fun box(): String {
+    test({ "1" }, { "2" })
+    return "OK"
+}