SourceMgr diagnotics printing: fix a bug where printing a fixit for a source
range that includes a tab character will cause out-of-bounds access to the
fixit string.

llvm-svn: 191563
diff --git a/llvm/lib/Support/SourceMgr.cpp b/llvm/lib/Support/SourceMgr.cpp
index fbcd8f9..d4b94f8 100644
--- a/llvm/lib/Support/SourceMgr.cpp
+++ b/llvm/lib/Support/SourceMgr.cpp
@@ -470,7 +470,7 @@
   if (FixItInsertionLine.empty())
     return;
   
-  for (size_t i = 0, e = FixItInsertionLine.size(), OutCol = 0; i != e; ++i) {
+  for (size_t i = 0, e = FixItInsertionLine.size(), OutCol = 0; i < e; ++i) {
     if (i >= LineContents.size() || LineContents[i] != '\t') {
       S << FixItInsertionLine[i];
       ++OutCol;