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

[via llvm-commits]

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@@ -158,11 +158,16 @@ class MemsetRanges {
 
   /// A sorted list of the memset ranges.
   SmallVector<MemsetRange, 8> Ranges;
-
-  const DataLayout &DL;
+  const DataLayout *DL;
 
 public:
-  MemsetRanges(const DataLayout &DL) : DL(DL) {}
+  MemsetRanges() {}
+  MemsetRanges(const DataLayout *DL) : DL(DL) {}
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XChy wrote:

No, I keep it just because its original implementation contains it...

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