Add possibility to interpret and fold IrStringConcatenation expression

js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/fir/FirJsCodegenBoxTestGenerated.java

@@ -21142,6 +21142,12 @@ public class FirJsCodegenBoxTestGenerated extends AbstractFirJsCodegenBoxTest {
                 runTest("compiler/testData/codegen/box/involvesIrInterpreter/dumpIrAndCheck/stdlibConst.kt");
             }
 
+            @Test
+            @TestMetadata("stringConcatenation.kt")
+            public void testStringConcatenation() throws Exception {
+                runTest("compiler/testData/codegen/box/involvesIrInterpreter/dumpIrAndCheck/stringConcatenation.kt");
+            }
+
             @Test
             @TestMetadata("stringOperations.kt")
             public void testStringOperations() throws Exception {

js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/ir/IrJsCodegenBoxTestGenerated.java

@@ -21142,6 +21142,12 @@ public class IrJsCodegenBoxTestGenerated extends AbstractIrJsCodegenBoxTest {
                 runTest("compiler/testData/codegen/box/involvesIrInterpreter/dumpIrAndCheck/stdlibConst.kt");
             }
 
+            @Test
+            @TestMetadata("stringConcatenation.kt")
+            public void testStringConcatenation() throws Exception {
+                runTest("compiler/testData/codegen/box/involvesIrInterpreter/dumpIrAndCheck/stringConcatenation.kt");
+            }
+
             @Test
             @TestMetadata("stringOperations.kt")
             public void testStringOperations() throws Exception {

js/js.tests/tests-gen/org/jetbrains/kotlin/js/test/ir/IrJsES6CodegenBoxTestGenerated.java

@@ -21142,6 +21142,12 @@ public class IrJsES6CodegenBoxTestGenerated extends AbstractIrJsES6CodegenBoxTes
                 runTest("compiler/testData/codegen/box/involvesIrInterpreter/dumpIrAndCheck/stdlibConst.kt");
             }
 
+            @Test
+            @TestMetadata("stringConcatenation.kt")
+            public void testStringConcatenation() throws Exception {
+                runTest("compiler/testData/codegen/box/involvesIrInterpreter/dumpIrAndCheck/stringConcatenation.kt");
+            }
+
             @Test
             @TestMetadata("stringOperations.kt")
             public void testStringOperations() throws Exception {