Extracted complex string concatenation bytecode test case into separate test data file.

compiler/testData/codegen/bytecodeText/stringOperations/multipleNestedConcat.kt

@@ -0,0 +1,10 @@
+// Uses 3 StringBuilders:
+// - In return expression
+// - In argument to 1st call to foo()
+// - In argument to 2nd call to foo() inside string literal
+fun test(s1: String, s2: String, s3: String): String {
+    fun foo(s: String) = s
+    return "foo: " + foo(s1 + s2 + " ${foo("\${s3.length} = ${s3.length}")}")
+}
+
+// 3 NEW java/lang/StringBuilder

compiler/testData/codegen/bytecodeText/stringOperations/nestedConcat.kt

@@ -29,13 +29,4 @@ fun test5(s1: String, s2: String, s3: String) =
 fun test6(s1: String, s2: String, s3: String) =
     "${"s1:" + "${" " + s1};"} ${"s2:" + "${" " + s2};"} ${"s3:" + "${" " + s3}"}"
 
-// Uses 3 StringBuilders:
+// 6 NEW java/lang/StringBuilder
-// - In return expression
-// - In argument to 1st call to foo()
-// - In argument to 2nd call to foo() inside string literal
-fun test7(s1: String, s2: String, s3: String): String {
-    fun foo(s: String) = s
-    return "foo: " + foo(s1 + s2 + " ${foo("\${s3.length} = ${s3.length}")}")
-}
-
-// 9 NEW java/lang/StringBuilder

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

@@ -3214,6 +3214,11 @@ public class BytecodeTextTestGenerated extends AbstractBytecodeTextTest {
             runTest("compiler/testData/codegen/bytecodeText/stringOperations/kt19037.kt");
         }
 
+        @TestMetadata("multipleNestedConcat.kt")
+        public void testMultipleNestedConcat() throws Exception {
+            runTest("compiler/testData/codegen/bytecodeText/stringOperations/multipleNestedConcat.kt");
+        }
+
         @TestMetadata("nestedConcat.kt")
         public void testNestedConcat() throws Exception {
             runTest("compiler/testData/codegen/bytecodeText/stringOperations/nestedConcat.kt");

compiler/tests/org/jetbrains/kotlin/codegen/ir/IrBytecodeTextTestGenerated.java

@@ -3214,6 +3214,11 @@ public class IrBytecodeTextTestGenerated extends AbstractIrBytecodeTextTest {
             runTest("compiler/testData/codegen/bytecodeText/stringOperations/kt19037.kt");
         }
 
+        @TestMetadata("multipleNestedConcat.kt")
+        public void testMultipleNestedConcat() throws Exception {
+            runTest("compiler/testData/codegen/bytecodeText/stringOperations/multipleNestedConcat.kt");
+        }
+
         @TestMetadata("nestedConcat.kt")
         public void testNestedConcat() throws Exception {
             runTest("compiler/testData/codegen/bytecodeText/stringOperations/nestedConcat.kt");