Debugger: Some workaround for strange clang debug info

The hash type is recorded as char if the std::unordered_map
key is a std::string.

Change-Id: I08f2ad9e46c88302d523b879558f65b4a86b0e2c
Reviewed-by: hjk <hjk121@nokiamail.com>
Debugger: Improve some libc++ dumper.

Change-Id: I18f2ad9e46c88302d523b879558f65b4a86b0e2c
Reviewed-by: hjk <hjk121@nokiamail.com>