[llvm] [SmallPtrSet] Don't leave tombstones in small mode (PR #96762)

[Jakub Kuderski via llvm-commits]

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@@ -352,7 +354,7 @@ class SmallPtrSetImpl : public SmallPtrSetImplBase {
   }
 
   /// erase - If the set contains the specified pointer, remove it and return
-  /// true, otherwise return false.
+  /// true, otherwise return false. Invalidates iterators if it returns true.
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kuhar wrote:

nit: In the first line, the documentation doesn't really explain what this function does. Also, I'd remove the `erase - ` prefix -- not sure where this came from. 

https://github.com/llvm/llvm-project/pull/96762