[llvm] [EquivalenceClasses] Introduce erase member function (PR #134660)

[Florian Hahn via llvm-commits]

================
@@ -78,11 +78,13 @@ template <class ElemTy> class EquivalenceClasses {
     // ECValue ctor - Start out with EndOfList pointing to this node, Next is
     // Null, isLeader = true.
     ECValue(const ElemTy &Elt)
-      : Leader(this), Next((ECValue*)(intptr_t)1), Data(Elt) {}
+        : Leader(this), Next((ECValue *)(intptr_t)1), Data(Elt) {}
 
     const ECValue *getLeader() const {
-      if (isLeader()) return this;
-      if (Leader->isLeader()) return Leader;
+      if (isLeader())
+        return this;
+      if (Leader->isLeader())
+        return Leader;
----------------
fhahn wrote:

Please avoid unrelated changes.

https://github.com/llvm/llvm-project/pull/134660