[llvm] [IR] Update docstring for stripAndAccumulateConstantOffset (PR #180365)

[Nikita Popov via llvm-commits]

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@@ -733,8 +733,8 @@ class Value {
   /// Note that this function will never return a nullptr. It will also never
   /// manipulate the \p Offset in a way that would not match the difference
   /// between the underlying value and the returned one. Thus, if no constant
-  /// offset was found, the returned value is the underlying one and \p Offset
-  /// is unchanged.
+  /// offset was found, \p Offset is unchanged and the returned value is the
+  /// first traversed value to introduce a non-constant offset.
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nikic wrote:

Offset is only unchanged if *no* constant offsets are stripped at all. That matches the start of the sentence but not the end.

https://github.com/llvm/llvm-project/pull/180365