Fix NDEBUG build.

llvm-svn: 238332
diff --git a/llvm/lib/MC/MCSection.cpp b/llvm/lib/MC/MCSection.cpp
index 26c6aad..04f932b 100644
--- a/llvm/lib/MC/MCSection.cpp
+++ b/llvm/lib/MC/MCSection.cpp
@@ -84,6 +84,7 @@
   return IP;
 }
 
+#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
 void MCSection::dump() {
   raw_ostream &OS = llvm::errs();
 
@@ -96,6 +97,7 @@
   }
   OS << "]>";
 }
+#endif
 
 MCSection::iterator MCSection::begin() { return Fragments.begin(); }