[NFC] Typo in EquivalenceClasses.h: determinstic->deterministic (#162314)

Author: jmmartinez

llvm/include/llvm/ADT/EquivalenceClasses.h

@@ -128,7 +128,7 @@ template <class ElemTy> class EquivalenceClasses {
   /// ECValues, it just keeps the key as part of the value.
   DenseMap<ElemTy, ECValue *> TheMapping;
 
-  /// List of all members, used to provide a determinstic iteration order.
+  /// List of all members, used to provide a deterministic iteration order.
   SmallVector<const ECValue *> Members;
 
   mutable BumpPtrAllocator ECValueAllocator;