[lldb] Fix -Wswitch in TypeSystemClang.cpp ('SveBoolx2' and 'SveBoolx4' not...

[lldb] Fix -Wswitch in TypeSystemClang.cpp ('SveBoolx2' and 'SveBoolx4' not handled in switch) (NFC)

/data/llvm-project/lldb/source/Plugins/TypeSystem/Clang/TypeSystemClang.cpp:4859:13: error: enumeration values 'SveBoolx2' and 'SveBoolx4' not handled in switch [-Werror,-Wswitch]
    switch (llvm::cast<clang::BuiltinType>(qual_type)->getKind()) {
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1 error generated.