[compiler-rt] [scudo] Add config option to modify get usable size behavior (PR #158710)

[via llvm-commits]

================
@@ -706,19 +706,25 @@ class Allocator {
         if (!getChunkFromBlock(Block, &Chunk, &Header) &&
             !getChunkFromBlock(addHeaderTag(Block), &Chunk, &Header))
           return;
+      } else if (!getChunkFromBlock(addHeaderTag(Block), &Chunk, &Header))
+        return;
----------------
ChiaHungDuan wrote:

```suggestion
      } else if (!getChunkFromBlock(addHeaderTag(Block), &Chunk, &Header)) {
        return;
      }
```

https://github.com/llvm/llvm-project/pull/158710