Revert of Introducing the LLVM greedy register allocator.

src/compiler/pipeline.cc

Index: src/compiler/pipeline.cc
diff --git a/src/compiler/pipeline.cc b/src/compiler/pipeline.cc
index 0d28dafb708d5f50121a4c8ee14c216c912218f4..59684c1ac10d2fca9bc7ae65b2a77d72cbcba910 100644
--- a/src/compiler/pipeline.cc
+++ b/src/compiler/pipeline.cc
@@ -742,25 +742,23 @@
 };
 
 
-template <typename RegAllocator>
 struct AllocateGeneralRegistersPhase {
   static const char* phase_name() { return "allocate general registers"; }
 
   void Run(PipelineData* data, Zone* temp_zone) {
-    RegAllocator allocator(data->register_allocation_data(), GENERAL_REGISTERS,
-                           temp_zone);
+    LinearScanAllocator allocator(data->register_allocation_data(),
+                                  GENERAL_REGISTERS, temp_zone);
     allocator.AllocateRegisters();
   }
 };
 
 
-template <typename RegAllocator>
 struct AllocateDoubleRegistersPhase {
   static const char* phase_name() { return "allocate double registers"; }
 
   void Run(PipelineData* data, Zone* temp_zone) {
-    RegAllocator allocator(data->register_allocation_data(), DOUBLE_REGISTERS,
-                           temp_zone);
+    LinearScanAllocator allocator(data->register_allocation_data(),
+                                  DOUBLE_REGISTERS, temp_zone);
     allocator.AllocateRegisters();
   }
 };
@@ -1271,13 +1269,8 @@
   if (verifier != nullptr) {
     CHECK(!data->register_allocation_data()->ExistsUseWithoutDefinition());
   }
-  if (FLAG_turbo_greedy_regalloc) {
-    Run<AllocateGeneralRegistersPhase<GreedyAllocator>>();
-    Run<AllocateDoubleRegistersPhase<GreedyAllocator>>();
-  } else {
-    Run<AllocateGeneralRegistersPhase<LinearScanAllocator>>();
-    Run<AllocateDoubleRegistersPhase<LinearScanAllocator>>();
-  }
+  Run<AllocateGeneralRegistersPhase>();
+  Run<AllocateDoubleRegistersPhase>();
   Run<AssignSpillSlotsPhase>();
 
   Run<CommitAssignmentPhase>();