diff --git a/llvm/lib/Support/CrashRecoveryContext.cpp b/llvm/lib/Support/CrashRecoveryContext.cpp
--- a/llvm/lib/Support/CrashRecoveryContext.cpp
+++ b/llvm/lib/Support/CrashRecoveryContext.cpp
@@ -84,8 +84,7 @@
 };
 } // namespace
 
-static ManagedStatic<std::mutex> gCrashRecoveryContextMutex;
-static bool gCrashRecoveryEnabled = false;
+static LLVM_THREAD_LOCAL bool gCrashRecoveryEnabled = false;
 
 static ManagedStatic<sys::ThreadLocal<const CrashRecoveryContext>>
        tlIsRecoveringFromCrash;
@@ -136,8 +135,6 @@
 }
 
 void CrashRecoveryContext::Enable() {
-  std::lock_guard<std::mutex> L(*gCrashRecoveryContextMutex);
-  // FIXME: Shouldn't this be a refcount or something?
   if (gCrashRecoveryEnabled)
     return;
   gCrashRecoveryEnabled = true;
@@ -145,7 +142,6 @@
 }
 
 void CrashRecoveryContext::Disable() {
-  std::lock_guard<std::mutex> L(*gCrashRecoveryContextMutex);
   if (!gCrashRecoveryEnabled)
     return;
   gCrashRecoveryEnabled = false;