[lldb] Remove limited temporary MultiPayloadEnum handling (#6756)

With recent work being done by @tbkka, this temporary workaround can be removed.

Author: kastiglione

lldb/source/Plugins/LanguageRuntime/Swift/SwiftLanguageRuntimeDynamicTypeResolution.cpp

@@ -1235,20 +1235,6 @@ findFieldWithName(const std::vector<swift::reflection::FieldInfo> &fields,
   return {true, child_indexes.size()};
 }
 
-static llvm::Optional<std::string>
-GetMultiPayloadEnumCaseName(const swift::reflection::EnumTypeInfo *eti,
-                            const DataExtractor &data) {
-  assert(eti->getEnumKind() == swift::reflection::EnumKind::MultiPayloadEnum);
-  auto payload_capacity = eti->getPayloadSize();
-  if (data.GetByteSize() == payload_capacity + 1) {
-    auto tag = data.GetDataStart()[payload_capacity];
-    const auto &cases = eti->getCases();
-    if (tag >= 0 && tag < cases.size())
-      return cases[tag].Name;
-  }
-  return {};
-}
-
 llvm::Optional<std::string> SwiftLanguageRuntimeImpl::GetEnumCaseName(
     CompilerType type, const DataExtractor &data, ExecutionContext *exe_ctx) {
   using namespace swift::reflection;
@@ -1267,12 +1253,6 @@ llvm::Optional<std::string> SwiftLanguageRuntimeImpl::GetEnumCaseName(
   if (eti->projectEnumValue(*GetMemoryReader(), addr, &case_index))
     return eti->getCases()[case_index].Name;
 
-  // Temporary workaround.
-  if (eti->getEnumKind() == EnumKind::MultiPayloadEnum &&
-      type.GetMangledTypeName().GetStringRef().startswith(
-          "$s10Foundation9IndexPathV7Storage"))
-    return GetMultiPayloadEnumCaseName(eti, data);
-
   return {};
 }
 

lldb/source/Plugins/TypeSystem/Swift/TypeSystemSwiftTypeRef.cpp

@@ -3795,10 +3795,8 @@ bool TypeSystemSwiftTypeRef::DumpTypeValue(
           }
         }
 
-      // No result available from the runtime, fallback to the AST.
-      // This can happen in two cases:
-      // 1. MultiPayloadEnums not currently supported by Swift reflection
-      // 2. Some clang imported enums
+      // No result available from the runtime, fallback to the AST. This occurs
+      // for some Clang imported enums
       if (auto *swift_ast_context = GetSwiftASTContext())
         return swift_ast_context->DumpTypeValue(
             ReconstructType(type), s, format, data, data_offset, data_byte_size,