Fix unused warning in opt builds.

In these builds, the asserts() are completely compiled out of the code
leaving "End" unused. Directly accessing it, should not have a
performance impact, as it is just a data member.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@182634 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/MC/MCModule.cpp b/lib/MC/MCModule.cpp
index 50bac47..17619d9 100644
--- a/lib/MC/MCModule.cpp
+++ b/lib/MC/MCModule.cpp
@@ -19,15 +19,14 @@
 }
 
 void MCModule::map(MCAtom *NewAtom) {
-  uint64_t Begin = NewAtom->Begin,
-           End = NewAtom->End;
+  uint64_t Begin = NewAtom->Begin;
 
-  assert(Begin < End && "Creating MCAtom with endpoints reversed?");
+  assert(Begin < NewAtom->End && "Creating MCAtom with endpoints reversed?");
 
   // Check for atoms already covering this range.
   AtomListTy::iterator I = std::lower_bound(atom_begin(), atom_end(),
                                             Begin, AtomComp);
-  assert((I == atom_end() || (*I)->getBeginAddr() > End)
+  assert((I == atom_end() || (*I)->getBeginAddr() > NewAtom->End)
          && "Offset range already occupied!");
 
   // Insert the new atom to the list.