FIC: Support conversions for suspend functions

compiler/testData/diagnostics/tests/funInterface/suspendFunInterfaceConversion.kt

@@ -0,0 +1,14 @@
+// !LANGUAGE: +NewInference +SamConversionForKotlinFunctions +SamConversionPerArgument +FunctionInterfaceConversion
+// !DIAGNOSTICS: -UNUSED_PARAMETER -NOTHING_TO_INLINE
+
+fun interface SuspendRunnable {
+    suspend fun invoke()
+}
+
+fun run(r: SuspendRunnable) {}
+
+suspend fun bar() {}
+
+fun test() {
+    run(::bar)
+}

compiler/testData/diagnostics/tests/funInterface/suspendFunInterfaceConversion.txt

@@ -0,0 +1,12 @@
+package
+
+public suspend fun bar(): kotlin.Unit
+public fun run(/*0*/ r: SuspendRunnable): kotlin.Unit
+public fun test(): kotlin.Unit
+
+public interface SuspendRunnable {
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public abstract suspend fun invoke(): kotlin.Unit
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}