MC CFG: Remap enough for data too, analoguous to r188873.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@188925 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/MC/MCAtom.cpp b/lib/MC/MCAtom.cpp
index 17a7468..6510289 100644
--- a/lib/MC/MCAtom.cpp
+++ b/lib/MC/MCAtom.cpp
@@ -44,7 +44,7 @@
 
 void MCDataAtom::addData(const MCData &D) {
   Data.push_back(D);
-  if (Data.size() > Begin - End)
+  if (Data.size() > Begin - End - 1)
     remap(Begin, End + 1);
 }