Fix for KT-14868: CCE in runtime while converting Number to Char

#KT-14868 Fixed

compiler/backend/src/org/jetbrains/kotlin/codegen/StackValue.java

@@ -405,11 +405,12 @@ public abstract class StackValue {
                 coerce(unboxedType, toType, v);
             }
             else {
-                if (toType.getSort() == Type.BOOLEAN || toType.getSort() == Type.CHAR) {
+                Type numberType = getType(Number.class);
+                if (toType.getSort() == Type.BOOLEAN || (toType.getSort() == Type.CHAR && !numberType.equals(fromType))) {
                     coerce(fromType, boxType(toType), v);
                 }
                 else {
-                    coerce(fromType, getType(Number.class), v);
+                    coerce(fromType, numberType, v);
                 }
                 unbox(toType, v);
             }

compiler/testData/codegen/box/primitiveTypes/kt14868.kt

@@ -0,0 +1,6 @@
+
+fun box(): String {
+    val x: Number = 75
+
+    return "O" + x.toChar()
+}

compiler/testData/codegen/light-analysis/primitiveTypes/kt14868.txt

@@ -0,0 +1,3 @@
+public final class Kt14868Kt {
+    public final static @org.jetbrains.annotations.NotNull method box(): java.lang.String
+}

compiler/tests-ir-jvm/tests/org/jetbrains/kotlin/codegen/ir/IrBlackBoxCodegenTestGenerated.java

@@ -10958,6 +10958,12 @@ public class IrBlackBoxCodegenTestGenerated extends AbstractIrBlackBoxCodegenTes
             doTest(fileName);
         }
 
+        @TestMetadata("kt14868.kt")
+        public void testKt14868() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/primitiveTypes/kt14868.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("kt1508.kt")
         public void testKt1508() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/primitiveTypes/kt1508.kt");

compiler/tests/org/jetbrains/kotlin/codegen/BlackBoxCodegenTestGenerated.java

@@ -10958,6 +10958,12 @@ public class BlackBoxCodegenTestGenerated extends AbstractBlackBoxCodegenTest {
             doTest(fileName);
         }
 
+        @TestMetadata("kt14868.kt")
+        public void testKt14868() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/primitiveTypes/kt14868.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("kt1508.kt")
         public void testKt1508() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/primitiveTypes/kt1508.kt");

compiler/tests/org/jetbrains/kotlin/codegen/LightAnalysisModeCodegenTestGenerated.java

@@ -10958,6 +10958,12 @@ public class LightAnalysisModeCodegenTestGenerated extends AbstractLightAnalysis
             doTest(fileName);
         }
 
+        @TestMetadata("kt14868.kt")
+        public void testKt14868() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/primitiveTypes/kt14868.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("kt1508.kt")
         public void testKt1508() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/primitiveTypes/kt1508.kt");

js/js.tests/test/org/jetbrains/kotlin/js/test/semantics/JsCodegenBoxTestGenerated.java

@@ -12849,6 +12849,12 @@ public class JsCodegenBoxTestGenerated extends AbstractJsCodegenBoxTest {
             doTest(fileName);
         }
 
+        @TestMetadata("kt14868.kt")
+        public void testKt14868() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/primitiveTypes/kt14868.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("kt1508.kt")
         public void testKt1508() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/primitiveTypes/kt1508.kt");