[MemorySSA] Fix spelling errors in MemorySSA.cpp. NFC

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@329230 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Analysis/MemorySSA.cpp

@@ -1466,7 +1466,7 @@ void MemorySSA::insertIntoListsBefore(MemoryAccess *What, const BasicBlock *BB,
     auto *Defs = getOrCreateDefsList(BB);
     // If we got asked to insert at the end, we have an easy job, just shove it
     // at the end. If we got asked to insert before an existing def, we also get
-    // an terator. If we got asked to insert before a use, we have to hunt for
+    // an iterator. If we got asked to insert before a use, we have to hunt for
     // the next def.
     if (WasEnd) {
       Defs->push_back(*What);
@@ -1485,7 +1485,7 @@ void MemorySSA::insertIntoListsBefore(MemoryAccess *What, const BasicBlock *BB,
   BlockNumberingValid.erase(BB);
 }
 
-// Move What before Where in the IR.  The end result is taht What will belong to
+// Move What before Where in the IR.  The end result is that What will belong to
 // the right lists and have the right Block set, but will not otherwise be
 // correct. It will not have the right defining access, and if it is a def,
 // things below it will not properly be updated.