Minor. Add tests to check returning Result from functions

Mainly, that virtual functions, returning Result, are mangled.
 #KT-45855

compiler/testData/codegen/box/inlineClasses/returnResult/class.kt

@@ -0,0 +1,8 @@
+// WITH_RUNTIME
+// KJS_WITH_FULL_RUNTIME
+
+class C {
+    fun foo(): Result<String> = Result.success("OK")
+}
+
+fun box() = C().foo().getOrThrow()

compiler/testData/codegen/box/inlineClasses/returnResult/classAnyOverride.kt

@@ -0,0 +1,16 @@
+// WITH_RUNTIME
+// KJS_WITH_FULL_RUNTIME
+
+interface I {
+    fun foo(): Any
+}
+
+class C : I {
+    override fun foo(): Result<String> = Result.success("OK")
+}
+
+
+fun box(): String {
+    if (((C() as I).foo() as Result<String>).getOrThrow() != "OK") return "FAIL 1"
+    return C().foo().getOrThrow()
+}

compiler/testData/codegen/box/inlineClasses/returnResult/classGenericOverride.kt

@@ -0,0 +1,15 @@
+// WITH_RUNTIME
+// KJS_WITH_FULL_RUNTIME
+
+interface I<T> {
+    fun foo(): T
+}
+
+class C : I<Result<String>> {
+    override fun foo(): Result<String> = Result.success("OK")
+}
+
+fun box(): String {
+    if (((C() as I<Result<String>>).foo() as Result<String>).getOrThrow() != "OK") return "FAIL 1"
+    return C().foo().getOrThrow()
+}

compiler/testData/codegen/box/inlineClasses/returnResult/classResultOverride.kt

@@ -0,0 +1,16 @@
+// WITH_RUNTIME
+// KJS_WITH_FULL_RUNTIME
+
+interface I {
+    fun foo(): Result<String>
+}
+
+class C : I {
+    override fun foo(): Result<String> = Result.success("OK")
+}
+
+
+fun box(): String {
+    if ((C() as I).foo().getOrThrow() != "OK") return "FAIL 1"
+    return C().foo().getOrThrow()
+}

compiler/testData/codegen/box/inlineClasses/returnResult/interface.kt

@@ -0,0 +1,10 @@
+// WITH_RUNTIME
+// KJS_WITH_FULL_RUNTIME
+
+interface I {
+    fun foo(): Result<String>
+}
+
+fun box() = object : I {
+    override fun foo() = Result.success("OK")
+}.foo().getOrThrow()

compiler/testData/codegen/box/inlineClasses/returnResult/topLevel.kt

@@ -0,0 +1,6 @@
+// WITH_RUNTIME
+// KJS_WITH_FULL_RUNTIME
+
+fun foo(): Result<String> = Result.success("OK")
+
+fun box() = foo().getOrThrow()