[PATCH] Fix printing signed character literals

[Nick Sumner]

Hi all,

The attached patch allows StmtPrinter to print signed character
literals. Given the code:
char c = '\200';

The character literal is presently printed as:
char c = '\Uffffff80';

The original literal has the signed value -128 (or unsigned value 128)
and only has any meaning when clamped to the extended ASCII range.
'\Uffffff80' isn't a valid character.

With the patch, the literal is printed as:
char c = '\x80';

As a side note, this doesn't handle multicharacter literals, but I
don't think there is enough information in the AST to make that
possible. They are implementation defined, anyway.

Best
Nick
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