Fix MCDataAtom never calling remap when adding data.

This patch fixes a small mistake in MCDataAtom::addData() where it doesn't ever
call remap():

-  if (Data.size() > Begin - End - 1)
+  if (Data.size() > End + 1 - Begin)
     remap(Begin, End + 1);

This is currently not visible because of another bug is the disassembler, so
the patch includes a unit test.

Patch by Stephen Checkoway.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192823 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/MC/MCAtom.cpp b/lib/MC/MCAtom.cpp
index 6510289..d0a64c3 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 - 1)
+  if (Data.size() > End + 1 - Begin)
     remap(Begin, End + 1);
 }