[Common] Discard the temp file while keeping the memory mapping open, on errors

Differential Revision: https://reviews.llvm.org/D51095

llvm-svn: 340635

lld/Common/ErrorHandler.cpp

@@ -47,8 +47,9 @@ ErrorHandler &lld::errorHandler() {
 }
 
 void lld::exitLld(int Val) {
-  // Delete the output buffer so that any tempory file is deleted.
-  errorHandler().OutputBuffer.reset();
+  // Delete any temporary file, while keeping the memory mapping open.
+  if (errorHandler().OutputBuffer)
+    errorHandler().OutputBuffer->discard();
 
   // Dealloc/destroy ManagedStatic variables before calling
   // _exit(). In a non-LTO build, this is a nop. In an LTO