[EarlyCSE][MemorySSA] Enable MemorySSA in function-simplification pass of EarlyCSE.

llvm-svn: 306477
diff --git a/llvm/lib/Transforms/IPO/PassManagerBuilder.cpp b/llvm/lib/Transforms/IPO/PassManagerBuilder.cpp
index 1a34eca..5538756 100644
--- a/llvm/lib/Transforms/IPO/PassManagerBuilder.cpp
+++ b/llvm/lib/Transforms/IPO/PassManagerBuilder.cpp
@@ -138,8 +138,8 @@
              "(default = 75)"));
 
 static cl::opt<bool> EnableEarlyCSEMemSSA(
-    "enable-earlycse-memssa", cl::init(false), cl::Hidden,
-    cl::desc("Enable the EarlyCSE w/ MemorySSA pass (default = off)"));
+    "enable-earlycse-memssa", cl::init(true), cl::Hidden,
+    cl::desc("Enable the EarlyCSE w/ MemorySSA pass (default = on)"));
 
 static cl::opt<bool> EnableGVNHoist(
     "enable-gvn-hoist", cl::init(false), cl::Hidden,