diff --git a/llvm/lib/Transforms/Scalar/Scalarizer.cpp b/llvm/lib/Transforms/Scalar/Scalarizer.cpp
--- a/llvm/lib/Transforms/Scalar/Scalarizer.cpp
+++ b/llvm/lib/Transforms/Scalar/Scalarizer.cpp
@@ -50,6 +50,10 @@
 
 #define DEBUG_TYPE "scalarizer"
 
+static cl::opt<bool>
+    DisableScalarizer("disable-scalarizer", cl::init(false), cl::Hidden,
+                      cl::desc("Don't execute the scalarizer pass"));
+
 static cl::opt<bool> ClScalarizeVariableInsertExtract(
     "scalarize-variable-insert-extract", cl::init(true), cl::Hidden,
     cl::desc("Allow the scalarizer pass to scalarize "
@@ -1011,6 +1015,9 @@
 }
 
 PreservedAnalyses ScalarizerPass::run(Function &F, FunctionAnalysisManager &AM) {
+  if (DisableScalarizer)
+    return PreservedAnalyses::all();
+
   Module &M = *F.getParent();
   unsigned ParallelLoopAccessMDKind =
       M.getContext().getMDKindID("llvm.mem.parallel_loop_access");