Fix for KT-15726: Kotlin can't compile nested try-catch with return

#KT-15726 Fixed

compiler/testData/codegen/box/controlStructures/kt15726.kt

@@ -0,0 +1,26 @@
+
+fun nyCompiler() {
+    try {
+        return
+    }
+    catch (e: Exception) {}
+    finally {
+        try {} catch (e: Exception) {}
+    }
+}
+
+
+fun nyCompiler2() {
+    try {
+        return
+    }
+    finally {
+        try {} catch (e: Exception) {}
+    }
+}
+
+fun box(): String {
+    nyCompiler()
+    nyCompiler2()
+    return "OK"
+}

compiler/testData/codegen/light-analysis/controlStructures/kt15726.txt

@@ -0,0 +1,6 @@
+@kotlin.Metadata
+public final class Kt15726Kt {
+    public final static @org.jetbrains.annotations.NotNull method box(): java.lang.String
+    public final static method nyCompiler(): void
+    public final static method nyCompiler2(): void
+}