r174810 - Comment parsing: use CharInfo.h

[Sean Silva]

namespace {
 bool isHTMLNamedCharacterReferenceCharacter(char C) {
-  return (C >= 'a' && C <= 'z') ||
-         (C >= 'A' && C <= 'Z');
+  return isLetter(C);
 }

FYI, the preference is to use static for these kind of helper functions: <
http://llvm.org/docs/CodingStandards.html#anonymous-namespaces>.

-- Sean Silva
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