Remove debug code

src/arena.c

@@ -9,7 +9,6 @@ struct MemoryBlockOptions {
     U32 commit_now_size;
     U32 page_size;
 };
-static U32 idx;
 static MemoryBlock *memoryblock_allocate(const MemoryBlockOptions *opts)
 {
     U32 aligned_size            = AlignUpPow2(opts->size, opts->page_size);
@@ -26,7 +25,6 @@ static MemoryBlock *memoryblock_allocate(const MemoryBlockOptions *opts)
     block->arena_offset  = 0;
     block->prev          = NULL;
     block->committed_end = aligned_commit_now_size;
-    block->idx = idx++;
 
     ASAN_POISON_MEMORY_REGION(block->base, block->size);
     ASAN_UNPOISON_MEMORY_REGION(block, MemoryBlock_Header_Size);

src/arena.h

@@ -18,7 +18,6 @@ struct MemoryBlock {
     U64 arena_offset;   // absolute offset of base relative to the first linked arena
     U32 committed_end;  // end of committed region. Will be page aligned
     MemoryBlock *prev;
-    U32 idx;
 };
 
 typedef struct Arena Arena;