Revert "[Passes] Parallelize the layout pass sort."

Inconsistent (and wrong) sort order on non-Windows.

llvm-svn: 182975

lld/lib/Passes/LayoutPass.cpp

@@ -12,7 +12,6 @@
 
 #include "lld/Passes/LayoutPass.h"
 #include "lld/Core/Instrumentation.h"
-#include "lld/Core/Parallel.h"
 #include "llvm/Support/Debug.h"
 
 using namespace lld;
@@ -426,7 +425,7 @@ void LayoutPass::perform(MutableFile &mergedFile) {
   });
 
   // sort the atoms
-  parallel_sort(atomRange.begin(), atomRange.end(), _compareAtoms);
+  std::sort(atomRange.begin(), atomRange.end(), _compareAtoms);
 
   DEBUG({
     llvm::dbgs() << "sorted atoms:\n";