[PM] GVNSink is off by default, fix an obvious typo.

llvm-svn: 304497
diff --git a/llvm/lib/Transforms/IPO/PassManagerBuilder.cpp b/llvm/lib/Transforms/IPO/PassManagerBuilder.cpp
index 9fd3a90..16fba32 100644
--- a/llvm/lib/Transforms/IPO/PassManagerBuilder.cpp
+++ b/llvm/lib/Transforms/IPO/PassManagerBuilder.cpp
@@ -157,7 +157,7 @@
 
 static cl::opt<bool> EnableGVNSink(
     "enable-gvn-sink", cl::init(false), cl::Hidden,
-    cl::desc("Enable the GVN sinking pass (default = on)"));
+    cl::desc("Enable the GVN sinking pass (default = off)"));
 
 PassManagerBuilder::PassManagerBuilder() {
     OptLevel = 2;