Add tests for obsolete issues

#KT-38804 Obsolete
 #KT-38801 Obsolete
 #KT-38835 Obsolete
 #KT-38737 Obsolete
 #KT-38664 Obsolete
 #KT-38549 Obsolete
 #KT-38766 Obsolete
 #KT-38714 Obsolete

compiler/testData/diagnostics/tests/smartCasts/smartCastOnLastExpressionOfLambdaAfterNothing.fir.kt

@@ -0,0 +1,14 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+
+class Inv<T>
+
+fun <T> foo(f: () -> T): Inv<T> = TODO()
+
+fun myExit(): Nothing = TODO()
+
+fun test(x: String?): Inv<String> {
+    return foo {
+        if (x == null) myExit()
+        x
+    }
+}

compiler/testData/diagnostics/tests/smartCasts/smartCastOnLastExpressionOfLambdaAfterNothing.kt

@@ -0,0 +1,14 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+
+class Inv<T>
+
+fun <T> foo(f: () -> T): Inv<T> = TODO()
+
+fun myExit(): Nothing = TODO()
+
+fun test(x: String?): Inv<String> {
+    return foo {
+        if (x == null) myExit()
+        <!DEBUG_INFO_SMARTCAST!>x<!>
+    }
+}

compiler/testData/diagnostics/tests/smartCasts/smartCastOnLastExpressionOfLambdaAfterNothing.txt

@@ -0,0 +1,12 @@
+package
+
+public fun </*0*/ T> foo(/*0*/ f: () -> T): Inv<T>
+public fun myExit(): kotlin.Nothing
+public fun test(/*0*/ x: kotlin.String?): Inv<kotlin.String>
+
+public final class Inv</*0*/ T> {
+    public constructor Inv</*0*/ T>()
+    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 open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}