[cfe-commits] [Patch] Fix crash when attempting to dump a StringLiteral with wchar's in it.

[Richard Trieu]

There are several places that crash when processing wchars: the dump
methods used for debugging, -ast-dump, and -ast-dump-xml.  This was from
StmtDumper attempting to get a standard string from StringLiteral, which is
only allowed when the string is composed of standard chars.  A different
visitor, StmtPrinter, already has the logic to nicely print out strings of
different types.  This patch moves this logic into a function in
StringLiteral class and has both StmtDumper and StmtPrinter call this new
function.
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