llvm-mc: Delete output files on error.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@98445 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/llvm-mc/llvm-mc.cpp b/tools/llvm-mc/llvm-mc.cpp
index 666f0ba..66e1260 100644
--- a/tools/llvm-mc/llvm-mc.cpp
+++ b/tools/llvm-mc/llvm-mc.cpp
@@ -311,6 +311,10 @@
   if (Out != &fouts())
     delete Out;
 
+  // Delete output on errors.
+  if (Res && OutputFilename != "-")
+    sys::Path(OutputFilename).eraseFromDisk();
+
   return Res;
 }