Add CharSourceRange -- a half-open character range, which will be used in IDE

integration

Motivation: libIDE clients should be simple, and they should not have to
translate token-based SourceRanges to character locations.

This also allows us to remove the dependency of DiagnosticConsumer on the
Lexer.  Now the DiagnosticEngine translates the diagnostics to CharSourceRanges
and passes character-based ranges to the DiagnosticConsumer.


Swift SVN r7173

lib/Basic/DiagnosticConsumer.cpp

@@ -15,7 +15,6 @@
 //===----------------------------------------------------------------------===//
 
 #include "swift/Basic/DiagnosticConsumer.h"
-#include "swift/Parse/Lexer.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/raw_ostream.h"
@@ -24,18 +23,6 @@ using namespace swift;
 
 DiagnosticConsumer::~DiagnosticConsumer() { }
 
-llvm::SMRange DiagnosticConsumer::getRawRange(SourceManager &SM,
-                                              DiagnosticInfo::Range R) {
-  SourceLoc End;
-  if (R.IsTokenRange)
-    End = Lexer::getLocForEndOfToken(SM, R.End);
-  else
-    End = R.End;
-
-  return llvm::SMRange(getRawLoc(R.Start), getRawLoc(End));
-}
-
-
 void NullDiagnosticConsumer::handleDiagnostic(SourceManager &SM,
                                               SourceLoc Loc,
                                               DiagnosticKind Kind,