Turn GVN on by default.

llvm-svn: 41787

llvm/tools/llvm-ld/Optimize.cpp

@@ -166,8 +166,7 @@ void Optimize(Module* M) {
     addPass(Passes, createGlobalsModRefPass());      // IP alias analysis
 
     addPass(Passes, createLICMPass());               // Hoist loop invariants
-    addPass(Passes, createLoadValueNumberingPass()); // GVN for load instrs
-    addPass(Passes, createGCSEPass());               // Remove common subexprs
+    addPass(Passes, createGVNPass());                  // Remove redundancies
     addPass(Passes, createDeadStoreEliminationPass()); // Nuke dead stores
 
     // Cleanup and simplify the code after the scalar optimizations.

llvm/tools/opt/opt.cpp

@@ -282,8 +282,7 @@ void AddStandardCompilePasses(PassManager &PM) {
   addPass(PM, createIndVarSimplifyPass());       // Canonicalize indvars
   addPass(PM, createLoopUnrollPass());           // Unroll small loops
   addPass(PM, createInstructionCombiningPass()); // Clean up after the unroller
-  addPass(PM, createLoadValueNumberingPass());   // GVN for load instructions
-  addPass(PM, createGCSEPass());                 // Remove common subexprs
+  addPass(PM, createGVNPass());                  // Remove redundancies
   addPass(PM, createSCCPPass());                 // Constant prop with SCCP
 
   // Run instcombine after redundancy elimination to exploit opportunities