[AccelTable][NFC] Fix typos and duplicated code (#76155)

Renaming a member variable from "Endoding" to "Encoding".

Also replace inlined code for "isNormalized" with a call to the
function, so that if the definition of normalization ever changes, we
only need to change the one place.

llvm/include/llvm/CodeGen/AccelTable.h

@@ -270,16 +270,14 @@ class DWARF5AccelTableData : public AccelTableData {
 #endif
 
   uint64_t getDieOffset() const {
-    assert(std::holds_alternative<uint64_t>(OffsetVal) &&
-           "Accessing DIE Offset before normalizing.");
+    assert(isNormalized() && "Accessing DIE Offset before normalizing.");
     return std::get<uint64_t>(OffsetVal);
   }
   unsigned getDieTag() const { return DieTag; }
   unsigned getUnitID() const { return UnitID; }
   bool isTU() const { return IsTU; }
   void normalizeDIEToOffset() {
-    assert(std::holds_alternative<const DIE *>(OffsetVal) &&
-           "Accessing offset after normalizing.");
+    assert(!isNormalized() && "Accessing offset after normalizing.");
     OffsetVal = std::get<const DIE *>(OffsetVal)->getOffset();
   }
   bool isNormalized() const {
@@ -309,7 +307,7 @@ class DWARF5AccelTable : public AccelTable<DWARF5AccelTableData> {
 public:
   struct UnitIndexAndEncoding {
     unsigned Index;
-    DWARF5AccelTableData::AttributeEncoding Endoding;
+    DWARF5AccelTableData::AttributeEncoding Encoding;
   };
   /// Returns type units that were constructed.
   const TUVectorTy &getTypeUnitsSymbols() { return TUSymbolsOrHashes; }

llvm/lib/CodeGen/AsmPrinter/AccelTable.cpp

@@ -412,7 +412,7 @@ static uint32_t constructAbbreviationTag(
     const std::optional<DWARF5AccelTable::UnitIndexAndEncoding> &EntryRet) {
   uint32_t AbbrvTag = 0;
   if (EntryRet)
-    AbbrvTag |= 1 << EntryRet->Endoding.Index;
+    AbbrvTag |= 1 << EntryRet->Encoding.Index;
   AbbrvTag |= 1 << dwarf::DW_IDX_die_offset;
   AbbrvTag |= Tag << LowerBitSize;
   return AbbrvTag;
@@ -429,7 +429,7 @@ void Dwarf5AccelTableWriter<DataT>::populateAbbrevsMap() {
         if (Abbreviations.count(AbbrvTag) == 0) {
           SmallVector<DWARF5AccelTableData::AttributeEncoding, 2> UA;
           if (EntryRet)
-            UA.push_back(EntryRet->Endoding);
+            UA.push_back(EntryRet->Encoding);
           UA.push_back({dwarf::DW_IDX_die_offset, dwarf::DW_FORM_ref4});
           Abbreviations.try_emplace(AbbrvTag, UA);
         }