[OSSACompleteLifetime] Fix error message.

Author: nate-chandler

lib/SIL/Utils/OSSALifetimeCompletion.cpp

@@ -362,8 +362,8 @@ void AvailabilityBoundaryVisitor::computeRegion(
             << "-sil-ownership-verify-all -Xllvm '-sil-print-function="
             << block->getFunction()->getName()
             << "' -Xllvm -sil-print-types -Xllvm -sil-print-module-on-error\n";
-        llvm::errs() << "Use the -disable-sil-ownership-verifier to disable "
-                        "this check.\n";
+        llvm::errs() << "Use the -disable-sil-ownership-verifier frontend flag "
+                        "to disable this check.\n";
         llvm::report_fatal_error("Invalid lifetime of value whose availability "
                                  "boundary is being visited.");
       }

validation-test/SILOptimizer/ossa_lifetime_completion_crash.sil

@@ -24,7 +24,7 @@ class C {}
 // CHECK: Something that ran before OSSALifetimeCompletion (the current pass, an earlier pass, SILGen) has introduced a leak of this value.
 // CHECK: Please rerun the crashing swift-frontend command with the following flags added and file a bug with the output:
 // CHECK: -sil-ownership-verify-all -Xllvm '-sil-print-function=leak_c' -Xllvm -sil-print-types -Xllvm -sil-print-module-on-error
-// CHECK: Use the -disable-sil-ownership-verifier to disable this check.
+// CHECK: Use the -disable-sil-ownership-verifier frontend flag to disable this check.
 // CHECK: Invalid lifetime of value whose availability boundary is being visited.
 sil [ossa] @leak_c : $@convention(thin) (@owned C) -> () {
 entry(%c : @owned $C):