[ThinLTO] Fix bot failure due to unused variable with NDEBUG

Put variable only used in assert under #ifndef NDEBUG.

This should fix bot failure at
http://lab.llvm.org:8011/builders/lld-x86_64-darwin13/builds/28537

llvm-svn: 284039

1 files changed, 4 insertions, 1 deletions

diff --git a/llvm/tools/llvm-lto2/llvm-lto2.cpp b/llvm/tools/llvm-lto2/llvm-lto2.cpp
index 0813f4728e6..a3cc6ef14d1 100644
--- a/llvm/tools/llvm-lto2/llvm-lto2.cpp
+++ b/llvm/tools/llvm-lto2/llvm-lto2.cpp
@@ -176,7 +176,10 @@ int main(int argc, char **argv) {
       }
     }
     for (auto I : CurrentFileSymResolutions) {
-      auto NumErased = CommandLineResolutions.erase({F, I.first});
+#ifndef NDEBUG
+      auto NumErased =
+#endif
+          CommandLineResolutions.erase({F, I.first});
       assert(NumErased > 0);
     }