[Bug preprocessor/23479] Implement binary constants with a "0b" prefix

[j at uriah dot heep dot sax dot de]

------- Additional Comments From j at uriah dot heep dot sax dot de  2005-08-19 
15:18 -------
Additional remark: GAS also recognizes 0bXXX constants.

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23479