Fixed bug in <when> codegen + test

backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/llvm/IrToBitcode.kt

@@ -2449,6 +2449,8 @@ internal class CodeGeneratorVisitor(val context: Context, val lifetimes: Map<IrE
                 functionGenerationContext.assignPhis(resultPhi to brResult)
             if (bbExit != null)
                 functionGenerationContext.br(bbExit)
+            else
+                functionGenerationContext.unreachable()
         }
         if (bbNext != null)                                                          // Switch generation to next or exit.
             functionGenerationContext.positionAtEnd(bbNext)

backend.native/tests/build.gradle

@@ -1370,6 +1370,11 @@ task advanced_when5(type: RunKonanTest) {
     source = "codegen/branching/advanced_when5.kt"
 }
 
+task when_with_try1(type: RunKonanTest) {
+    goldValue = "null\nnull\n42\n"
+    source = "codegen/branching/when_with_try1.kt"
+}
+
 task bool_yes(type: RunKonanTest) {
     source = "codegen/function/boolean.kt"
 }

backend.native/tests/codegen/branching/when_with_try1.kt

@@ -0,0 +1,22 @@
+package codegen.branching.when_with_try1
+
+import kotlin.test.*
+
+@Test fun runTest() {
+    println(foo(Any()))
+    println(foo("zzz"))
+    println(foo("42"))
+}
+
+fun foo(value: Any): Int? {
+    if (value is CharSequence) {
+        try {
+            return value.toString().toInt()
+        } catch (e: NumberFormatException) {
+            return null
+        }
+    }
+    else {
+        return null
+    }
+}