Fix redex class merge test

Summary:
```
In Kotlin 2.2, the Kotlin compiler generates additional local variable slots for flatMapIndexed$1 (2 more fields: L$2, L$3), changing its field count from 7 to 9. This changes its shape from (0,5,0,2,0,0,0) to (0,7,0,2,0,0,0).

Kotlin 2.1 (7 fields each):
- flatMapIndexed$1 → shape (0,5,0,2,0,0,0)
- runningReduceIndexed$1 → shape (0,5,0,2,0,0,0)
- Both in same shape group → CAN BE MERGED

Kotlin 2.2 (different field counts):
- flatMapIndexed$1 → shape (0,7,0,2,0,0,0) with 9 fields
- runningReduceIndexed$1 → shape (0,5,0,2,0,0,0) with 7 fields
- Different shape groups → runningReduceIndexed$1 is alone → CANNOT BE MERGED

The Fix

Updated the test to verify flatMapIndexed$1 and runningFoldIndexed$1 instead, as these two classes share the same shape (0,7,0,2,0,0,0) in Kotlin 2.2 and CAN be merged together.
```

```
 Kotlin 2.1 shapes:
  flatMapIndexed$1 -> (0,5,0,2,0,0,0)
  runningFoldIndexed$1 -> (0,6,0,2,0,0,0)
  runningReduceIndexed$1 -> (0,5,0,2,0,0,0)
  runningReduce$1 -> (0,5,0,1,0,0,0)
  zipWithNext$2 -> (0,5,0,1,0,0,0)
  children$1 -> (0,4,0,1,0,0,0)
  shuffled$1 -> (0,4,0,1,0,0,0)
  ifEmpty$1 -> (0,3,0,1,0,0,0)

  Kotlin 2.2 shapes:
  flatMapIndexed$1 -> (0,7,0,2,0,0,0)  # changed!
  runningFoldIndexed$1 -> (0,7,0,2,0,0,0)  # changed!
  runningReduceIndexed$1 -> (0,5,0,2,0,0,0)  # same
  runningReduce$1 -> (0,5,0,1,0,0,0)  # same
  zipWithNext$2 -> (0,6,0,1,0,0,0)  # changed!
  children$1 -> (0,4,0,1,0,0,0)  # same
  shuffled$1 -> (0,6,0,2,0,0,0)  # changed!
  ifEmpty$1 -> (0,4,0,1,0,0,0)  # changed!
```

Reviewed By: xuhdev

Differential Revision: D89639868

fbshipit-source-id: ac944dafc2dd31deb5a1ccc3459995c7812cab88

Author: Tiangong Li

test/instr/ClassMergingKotlinCoroutinesTestVerify.cpp

@@ -5,15 +5,31 @@
  * LICENSE file in the root directory of this source tree.
  */
 
+#include <cstdlib>
+#include <cstring>
+
 #include "Show.h"
 #include "verify/VerifyUtil.h"
 
 TEST_F(PostVerify, SinkCommonCtorInvocation) {
   auto* cls_coroutine_1 = find_class_named(
       classes, "Lkotlin/sequences/SequencesKt__SequencesKt$flatMapIndexed$1;");
-  auto* cls_coroutine_2 = find_class_named(
-      classes,
-      "Lkotlin/sequences/SequencesKt___SequencesKt$runningReduceIndexed$1;");
+
+  // TODO(T242960112): Kotlin 2.2 changed flatMapIndexed$1's field layout from
+  // 7 to 9 fields, altering its shape from (0,5,0,2,0,0,0) to (0,7,0,2,0,0,0).
+  const char* kotlin_version = std::getenv("kotlin_language_version");
+  bool is_kotlin_2_2_or_later =
+      kotlin_version != nullptr && std::strcmp(kotlin_version, "2.2") >= 0;
+
+  auto* cls_coroutine_2 =
+      is_kotlin_2_2_or_later
+          ? find_class_named(classes,
+                             "Lkotlin/sequences/"
+                             "SequencesKt___SequencesKt$runningFoldIndexed$1;")
+          : find_class_named(
+                classes,
+                "Lkotlin/sequences/"
+                "SequencesKt___SequencesKt$runningReduceIndexed$1;");
 
   verify_class_merged(cls_coroutine_1);
   verify_class_merged(cls_coroutine_2);