Handle withIndex() on arrays and CharSequences in ForLoopsLowering.

compiler/testData/codegen/bytecodeText/forLoop/forInArrayWithIndex/forInArrayWithIndexNoElementVar.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JVM_IR
 val arr = arrayOf("a", "b", "c", "d")
 
 fun box(): String {
@@ -19,3 +18,6 @@ fun box(): String {
 // 0 component1
 // 0 component2
 // 1 ARRAYLENGTH
+
+// The 1st ICONST_0 is for initializing the array. 2nd is for initializing the index in the lowered for-loop.
+// 2 ICONST_0

compiler/testData/codegen/bytecodeText/forLoop/forInArrayWithIndex/forInArrayWithIndexNoIndexVar.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JVM_IR
 val arr = arrayOf("a", "b", "c", "d")
 
 fun box(): String {
@@ -19,3 +18,6 @@ fun box(): String {
 // 0 component1
 // 0 component2
 // 1 ARRAYLENGTH
+
+// The 1st ICONST_0 is for initializing the array. 2nd is for initializing the index in the lowered for-loop.
+// 2 ICONST_0

compiler/testData/codegen/bytecodeText/forLoop/forInArrayWithIndex/forInEmptyArrayWithIndex.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JVM_IR
 val arr = intArrayOf()
 
 fun box(): String {
@@ -16,3 +15,6 @@ fun box(): String {
 // 0 component1
 // 0 component2
 // 1 ARRAYLENGTH
+
+// The 1st ICONST_0 is for initializing the array. 2nd is for initializing the index in the lowered for-loop.
+// 2 ICONST_0

compiler/testData/codegen/bytecodeText/forLoop/forInArrayWithIndex/forInIntArrayWithIndex.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JVM_IR
 val arr = intArrayOf(10, 20, 30, 40)
 
 fun box(): String {
@@ -17,3 +16,6 @@ fun box(): String {
 // 0 component1
 // 0 component2
 // 1 ARRAYLENGTH
+
+// The 1st ICONST_0 is for initializing the array. 2nd is for initializing the index in the lowered for-loop.
+// 2 ICONST_0

compiler/testData/codegen/bytecodeText/forLoop/forInArrayWithIndex/forInObjectArrayWithIndex.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JVM_IR
 val arr = arrayOf("a", "b", "c", "d")
 
 fun box(): String {
@@ -19,3 +18,6 @@ fun box(): String {
 // 0 component1
 // 0 component2
 // 1 ARRAYLENGTH
+
+// The 1st ICONST_0 is for initializing the array. 2nd is for initializing the index in the lowered for-loop.
+// 2 ICONST_0

compiler/testData/codegen/bytecodeText/forLoop/forInCharSequenceWithIndex/forInCharSequenceWithIndex.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JVM_IR
 val cs: CharSequence = "abcd"
 
 fun box(): String {
@@ -20,3 +19,6 @@ fun box(): String {
 // 0 component2
 // 1 length
 // 1 charAt
+
+// The ICONST_0 is for initializing the index in the lowered for-loop.
+// 1 ICONST_0

compiler/testData/codegen/bytecodeText/forLoop/forInCharSequenceWithIndex/forInEmptyStringWithIndex.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JVM_IR
 fun box(): String {
     for ((index, x) in "".withIndex()) {
         return "Loop over empty String should not be executed"
@@ -14,3 +13,6 @@ fun box(): String {
 // 0 component2
 // 1 length
 // 1 charAt
+
+// The ICONST_0 is for initializing the index in the lowered for-loop.
+// 1 ICONST_0

compiler/testData/codegen/bytecodeText/forLoop/forInCharSequenceWithIndex/forInStringWithIndex.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JVM_IR
 fun box(): String {
     val s = StringBuilder()
 
@@ -18,3 +17,6 @@ fun box(): String {
 // 0 component2
 // 1 length
 // 1 charAt
+
+// The ICONST_0 is for initializing the index in the lowered for-loop.
+// 1 ICONST_0

compiler/testData/codegen/bytecodeText/forLoop/forInCharSequenceWithIndex/forInStringWithIndexNoElementVar.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JVM_IR
 val xs = "abcd"
 
 fun box(): String {
@@ -20,3 +19,6 @@ fun box(): String {
 // 0 component2
 // 1 length
 // 1 charAt
+
+// The ICONST_0 is for initializing the index in the lowered for-loop.
+// 1 ICONST_0

compiler/testData/codegen/bytecodeText/forLoop/forInCharSequenceWithIndex/forInStringWithIndexNoIndexVar.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JVM_IR
 val xs = "abcd"
 
 fun box(): String {
@@ -20,3 +19,6 @@ fun box(): String {
 // 0 component2
 // 1 length
 // 1 charAt
+
+// The ICONST_0 is for initializing the index in the lowered for-loop.
+// 1 ICONST_0

compiler/testData/codegen/bytecodeText/forLoop/forInCharSequenceWithIndex/forInStringWithIndexWithExplicitlyTypedIndexVariable.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JVM_IR
 val xs = "abcd"
 
 fun useAny(x: Any) {}
@@ -23,3 +22,6 @@ fun box(): String {
 // 0 component2
 // 1 length
 // 1 charAt
+
+// The ICONST_0 is for initializing the index in the lowered for-loop.
+// 1 ICONST_0