Support large strings in indy-with-constants concatenation

#KT-47917 Fixed

compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/codegen/ExpressionCodegen.kt

@@ -869,12 +869,9 @@ class ExpressionCodegen(
     private fun generateStringConstant(value: String) {
         val length = value.length
 
-        // Strings in constant pool contain at most 2^16-1 = 65535 bytes.
-        // Non-BMP characters in UTF8 require at most 4 bytes.
-        val maxPartLength = 65535 / 4
-
-        if (length <= maxPartLength) {
-            mv.aconst(value)
+        val splitted = splitStringConstant(value)
+        if (splitted.size == 1) {
+            mv.aconst(splitted.first())
         } else {
             // Split strings into parts, each of which satisfies JVM class file constant pool constraints.
             // Note that even if we split surrogate pairs between parts, they will be joined on concatenation.
@@ -882,12 +879,9 @@ class ExpressionCodegen(
             mv.dup()
             mv.iconst(length)
             mv.invokespecial("java/lang/StringBuilder", "<init>", "(I)V", false)
-            var i = 0
-            while (i < length) {
-                val j = minOf(i + maxPartLength, length)
-                mv.aconst(value.substring(i, j))
+            for (part in splitted) {
+                mv.aconst(part)
                 mv.invokevirtual("java/lang/StringBuilder", "append", "(Ljava/lang/String;)Ljava/lang/StringBuilder;", false)
-                i += maxPartLength
             }
             mv.invokevirtual("java/lang/StringBuilder", "toString", "()Ljava/lang/String;", false)
         }