SWDEV-557412 - Incorporate proper chunk offset when remapping virtual memory (#1848)

* SWDEV-557412 - Incorporate proper offset when remapping virtual memory

* Fix condition to check if VMHeap allocation address matches a chunk address

* Move offset calculation outside if/else block

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Co-authored-by: JeniferC99 <150404595+JeniferC99@users.noreply.github.com>

projects/clr/rocclr/platform/vmheap.cpp

@@ -239,7 +239,10 @@ address VmHeap::Alloc(size_t size) {
   size_t offset = 0;
   auto hb = AllocBlock(size + block_alignment_);
   if (hb != nullptr) {
-    offset = ((hb->Offset() & ~kChunkSize) == 0) ? hb->Offset() + block_alignment_ : hb->Offset();
+    // Add 256-byte offset if virtual address matches chunk address to avoid map conflicts
+    offset = ((hb->Offset() & (kChunkSize - 1)) == 0)
+               ? hb->Offset() + block_alignment_
+               : hb->Offset();
     ptr = base_address_ + offset;
   } else {
     return nullptr;