[llvm] [MemCpyOpt] Merge memset and skip unrelated clobber in one scan (PR #90350)

[Nikita Popov via llvm-commits]

================
@@ -191,6 +196,18 @@ class MemsetRanges {
 
   void addRange(int64_t Start, int64_t Size, Value *Ptr, MaybeAlign Alignment,
                 Instruction *Inst);
+
+  bool flush(MemorySSAUpdater *MSSAU, Instruction *InsertPoint,
+             MemoryUseOrDef *&MemInsertPoint);
+
+  // The first store/memset instruction
----------------
nikic wrote:

```suggestion
  /// The first store/memset instruction.
```
etc

https://github.com/llvm/llvm-project/pull/90350