[lldb] Add missing case statements for SubstBuiltinTemplatePack (#154606)

This patch fixes:

lldb/source/Plugins/TypeSystem/Clang/TypeSystemClang.cpp:4148:11:
error: enumeration value 'SubstBuiltinTemplatePack' not handled in
switch [-Werror,-Wswitch]
4148 |   switch (qual_type->getTypeClass()) {
      |           ^~~~~~~~~~~~~~~~~~~~~~~~~

lldb/source/Plugins/TypeSystem/Clang/TypeSystemClang.cpp:4852:11:
error: enumeration value 'SubstBuiltinTemplatePack' not handled in
switch [-Werror,-Wswitch]
4852 |   switch (qual_type->getTypeClass()) {
      |           ^~~~~~~~~~~~~~~~~~~~~~~~~

lldb/source/Plugins/TypeSystem/Clang/TypeSystemClang.cpp:5153:11:
error: enumeration value 'SubstBuiltinTemplatePack' not handled in
switch [-Werror,-Wswitch]
5153 |   switch (qual_type->getTypeClass()) {
      |           ^~~~~~~~~~~~~~~~~~~~~~~~~

Author: kazutakahirata

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

@@ -4275,6 +4275,8 @@ TypeSystemClang::GetTypeClass(lldb::opaque_compiler_type_t type) {
     break;
   case clang::Type::HLSLInlineSpirv:
     break;
+  case clang::Type::SubstBuiltinTemplatePack:
+    break;
   }
   // We don't know hot to display this type...
   return lldb::eTypeClassOther;
@@ -5139,6 +5141,8 @@ lldb::Encoding TypeSystemClang::GetEncoding(lldb::opaque_compiler_type_t type,
     break;
   case clang::Type::HLSLInlineSpirv:
     break;
+  case clang::Type::SubstBuiltinTemplatePack:
+    break;
   }
   count = 0;
   return lldb::eEncodingInvalid;
@@ -5307,6 +5311,8 @@ lldb::Format TypeSystemClang::GetFormat(lldb::opaque_compiler_type_t type) {
     break;
   case clang::Type::HLSLInlineSpirv:
     break;
+  case clang::Type::SubstBuiltinTemplatePack:
+    break;
   }
   // We don't know hot to display this type...
   return lldb::eFormatBytes;