[LLDB] Default implementation for pack indexing types. (#79695)

We do not handle pack indexing types (added by yet #72644) but we add them to some switch
statement to ensure CI builds do not fail.

Author: cor3ntin

lldb/source/Plugins/TypeSystem/Clang/TypeSystemClang.cpp

@@ -4189,6 +4189,10 @@ TypeSystemClang::GetTypeClass(lldb::opaque_compiler_type_t type) {
   case clang::Type::ConstantMatrix:
   case clang::Type::DependentSizedMatrix:
     break;
+
+  // We don't handle pack indexing yet
+  case clang::Type::PackIndexing:
+    break;
   }
   // We don't know hot to display this type...
   return lldb::eTypeClassOther;
@@ -5066,6 +5070,10 @@ lldb::Encoding TypeSystemClang::GetEncoding(lldb::opaque_compiler_type_t type,
   case clang::Type::ConstantMatrix:
   case clang::Type::DependentSizedMatrix:
     break;
+
+  // We don't handle pack indexing yet
+  case clang::Type::PackIndexing:
+    break;
   }
   count = 0;
   return lldb::eEncodingInvalid;
@@ -5221,6 +5229,10 @@ lldb::Format TypeSystemClang::GetFormat(lldb::opaque_compiler_type_t type) {
   case clang::Type::ConstantMatrix:
   case clang::Type::DependentSizedMatrix:
     break;
+
+  // We don't handle pack indexing yet
+  case clang::Type::PackIndexing:
+    break;
   }
   // We don't know hot to display this type...
   return lldb::eFormatBytes;