[lldb/StringPrinter] Convert DecodedCharBuffer to a class, NFC
authorVedant Kumar <vsk@apple.com>
Wed, 3 Jun 2020 18:51:22 +0000 (11:51 -0700)
committerVedant Kumar <vsk@apple.com>
Wed, 3 Jun 2020 19:24:23 +0000 (12:24 -0700)
commit7822b8a817d85827110f3047f4ec63f6825743a4
treeba624cc459700199e24e061651ca12f96e3da502
parenta3fcd6476a4e4270ea19137656d94d395d303349
[lldb/StringPrinter] Convert DecodedCharBuffer to a class, NFC

The m_size and m_data members of DecodedCharBuffer are meant to be
private.
lldb/source/DataFormatters/StringPrinter.cpp