sil-opt: add an -enable-experimental-concurrency option.

Author: eeckstein

tools/sil-opt/SILOpt.cpp

@@ -99,6 +99,10 @@ static llvm::cl::opt<bool>
 DisableObjCInterop("disable-objc-interop",
                    llvm::cl::desc("Disable Objective-C interoperability."));
 
+static llvm::cl::opt<bool>
+EnableExperimentalConcurrency("enable-experimental-concurrency",
+                   llvm::cl::desc("Enable experimental concurrency model."));
+
 static llvm::cl::opt<bool>
 VerifyExclusivity("enable-verify-exclusivity",
                   llvm::cl::desc("Verify the access markers used to enforce exclusivity."));
@@ -341,6 +345,10 @@ int main(int argc, char **argv) {
   Invocation.getLangOptions().DisableAvailabilityChecking = true;
   Invocation.getLangOptions().EnableAccessControl = false;
   Invocation.getLangOptions().EnableObjCAttrRequiresFoundation = false;
+  
+  Invocation.getLangOptions().EnableExperimentalConcurrency =
+    EnableExperimentalConcurrency;
+
   Invocation.getLangOptions().EnableObjCInterop =
     EnableObjCInterop ? true :
     DisableObjCInterop ? false : llvm::Triple(Target).isOSDarwin();