[AMDGPU] Enable DPP combiner pass by default.

Related revisions: https://reviews.llvm.org/D55444, https://reviews.llvm.org/D55314

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@353691 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/AMDGPU/AMDGPUTargetMachine.cpp b/lib/Target/AMDGPU/AMDGPUTargetMachine.cpp
index 43e2de5..f9bd500 100644
--- a/lib/Target/AMDGPU/AMDGPUTargetMachine.cpp
+++ b/lib/Target/AMDGPU/AMDGPUTargetMachine.cpp
@@ -108,7 +108,7 @@
 static cl::opt<bool> EnableDPPCombine(
   "amdgpu-dpp-combine",
   cl::desc("Enable DPP combiner"),
-  cl::init(false));
+  cl::init(true));
 
 // Enable address space based alias analysis
 static cl::opt<bool> EnableAMDGPUAliasAnalysis("enable-amdgpu-aa", cl::Hidden,