[FIR] fix internal error on suspend conversion with not-computed return type

^KT-62836 Fixed

compiler/testData/codegen/box/coroutines/suspendConversion/subtypeOfFunctionalTypeToSuspendConversion.kt

@@ -3,8 +3,6 @@
 // WITH_COROUTINES
 // IGNORE_BACKEND: JVM, JS, JS_IR
 // IGNORE_BACKEND: JS_IR_ES6
-// IGNORE_REVERSED_RESOLVE
-// KT-62836
 
 import helpers.*
 import kotlin.coroutines.*

compiler/testData/diagnostics/tests/suspendConversion/implicitInvoke.kt

@@ -0,0 +1,8 @@
+// FIR_IDENTICAL
+fun box() = useSuspendFunInt(Test())
+
+fun useSuspendFunInt(fn: suspend () -> String): String = ""
+
+open class Test : () -> String {
+    override fun invoke() = "OK"
+}

compiler/testData/diagnostics/tests/suspendConversion/implicitInvokeFromChildClass.kt

@@ -1,5 +1,4 @@
 // FIR_IDENTICAL
-// IGNORE_DIAGNOSTIC_API
 // ISSUE: KT-62836
 fun box() {
     useSuspendFunInt(Child())

compiler/testData/diagnostics/tests/suspendConversion/implicitInvokeWithSpecificType.fir.kt

@@ -1,7 +1,6 @@
-// IGNORE_DIAGNOSTIC_API
 // ISSUE: KT-62836
 fun box() {
-    useSuspendFunInt(Test())
+    useSuspendFunInt(<!ARGUMENT_TYPE_MISMATCH!>Test()<!>)
 }
 
 fun useSuspendFunInt(fn: suspend () -> String): String = ""

compiler/testData/diagnostics/tests/suspendConversion/implicitInvokeWithSpecificType.kt

@@ -1,4 +1,3 @@
-// IGNORE_DIAGNOSTIC_API
 // ISSUE: KT-62836
 fun box() {
     useSuspendFunInt(<!TYPE_MISMATCH!>Test()<!>)