Extract Function: Support implicit abnormal exits via Nothing-typed expressions

idea/src/org/jetbrains/kotlin/idea/refactoring/introduce/extractionEngine/extractableAnalysisUtil.kt

@@ -243,6 +243,8 @@ private fun ExtractionData.analyzeControlFlow(
                 when {
                     it !is ReturnValueInstruction && it !is ReturnNoValueInstruction && it.owner != pseudocode ->
                         null
+                    it is UnconditionalJumpInstruction && it.targetLabel.isJumpToError ->
+                        it
                     e != null && e !is KtBreakExpression && e !is KtContinueExpression ->
                         it.previousInstructions.firstOrNull()
                     else ->
@@ -268,7 +270,7 @@ private fun ExtractionData.analyzeControlFlow(
                         || element is KtContinueExpression) {
                     jumpExits.add(inst)
                 }
-                else if (element !is KtThrowExpression) {
+                else if (element !is KtThrowExpression && !inst.targetLabel.isJumpToError) {
                     defaultExits.add(inst)
                 }
             }

idea/testData/refactoring/extractFunction/controlFlow/throws/implicitThrow.kt

@@ -0,0 +1,7 @@
+// WITH_RUNTIME
+// PARAM_DESCRIPTOR: value-parameter a: kotlin.Int? defined in foo
+// PARAM_TYPES: kotlin.Int?
+fun foo(a: Int?): Int {
+    <selection>val n = a ?: error("")
+    return n + 1</selection>
+}

idea/testData/refactoring/extractFunction/controlFlow/throws/implicitThrow.kt.after

@@ -0,0 +1,11 @@
+// WITH_RUNTIME
+// PARAM_DESCRIPTOR: value-parameter a: kotlin.Int? defined in foo
+// PARAM_TYPES: kotlin.Int?
+fun foo(a: Int?): Int {
+    return i(a)
+}
+
+private fun i(a: Int?): Int {
+    val n = a ?: error("")
+    return n + 1
+}

idea/tests/org/jetbrains/kotlin/idea/refactoring/introduce/ExtractionTestGenerated.java

@@ -1682,6 +1682,12 @@ public class ExtractionTestGenerated extends AbstractExtractionTest {
                     doExtractFunctionTest(fileName);
                 }
 
+                @TestMetadata("implicitThrow.kt")
+                public void testImplicitThrow() throws Exception {
+                    String fileName = KotlinTestUtils.navigationMetadata("idea/testData/refactoring/extractFunction/controlFlow/throws/implicitThrow.kt");
+                    doExtractFunctionTest(fileName);
+                }
+
                 @TestMetadata("nonValuedReturnWithThrow.kt")
                 public void testNonValuedReturnWithThrow() throws Exception {
                     String fileName = KotlinTestUtils.navigationMetadata("idea/testData/refactoring/extractFunction/controlFlow/throws/nonValuedReturnWithThrow.kt");