Update open source checker build to checker-271.

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@174758 91177308-0d34-0410-b5e6-96231b3b80d8
Note that checker-271 is newer than the analyzer in Xcode 4.6

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@174759 91177308-0d34-0410-b5e6-96231b3b80d8
Pull Lexer's CharInfo table out for general use throughout Clang.

Rewriting the same predicates over and over again is bad for code size and
code maintainence. Using the functions in <ctype.h> is generally unsafe
unless they are specified to be locale-independent (i.e. only isdigit and
isxdigit).

The next commit will try to clean up uses of <ctype.h> functions within Clang.

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@174765 91177308-0d34-0410-b5e6-96231b3b80d8
StmtPrinter: Write large char values using \u or \U.

This may not always be valid, but we were previously just
emitting them raw.

While here, s/isprint/isPrintable/ (using the new CharInfo).

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@174766 91177308-0d34-0410-b5e6-96231b3b80d8
Simplify logic for avoiding concatenation after numeric constants.

I threw in a couple of test cases for UD-suffixes -- already working, but
it wasn't immediately obvious to me.

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@174767 91177308-0d34-0410-b5e6-96231b3b80d8
Excise <cctype> from Clang (except clang-tblgen) in favor of CharInfo.h.

Nearly all of these changes are one-to-one replacements; the few that
aren't have to do with custom identifier validation.

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@174768 91177308-0d34-0410-b5e6-96231b3b80d8
CharInfo: Add missing "using namespace clang::charinfo" in .cpp file.

Should fix the MSC bot.

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@174769 91177308-0d34-0410-b5e6-96231b3b80d8