Remove support for optimized dart leaf functions.

runtime/vm/flow_graph_compiler_x64.cc

Index: runtime/vm/flow_graph_compiler_x64.cc
===================================================================
--- runtime/vm/flow_graph_compiler_x64.cc	(revision 13457)
+++ runtime/vm/flow_graph_compiler_x64.cc	(working copy)
@@ -43,21 +43,6 @@
 
   ASSERT(deoptimization_env() != NULL);
 
-  if (compiler->IsLeaf()) {
-    __ Comment("Leaf method, lazy PC marker setup");
-    // TODO(srdjan): Can we use TMP instead of RAX? We must guarantee that
-    // TMP is never part of deoptimization environment.
-    __ pushq(RAX);  // Preserve RAX.
-    Label L;
-    __ call(&L);
-    const intptr_t offset = assem->CodeSize();
-    __ Bind(&L);
-    __ popq(RAX);
-    __ subq(RAX,
-        Immediate(offset - AssemblerMacros::kOffsetOfSavedPCfromEntrypoint));
-    __ movq(Address(RBP, -kWordSize), RAX);
-    __ popq(RAX);  // Restore RAX.
-  }
   __ call(&StubCode::DeoptimizeLabel());
   set_pc_offset(assem->CodeSize());
   __ int3();
@@ -831,7 +816,6 @@
                          Isolate::kNoDeoptId,
                          0);  // No token position.
   } else {
-    ASSERT(!IsLeaf());
     // Invoke noSuchMethod function.
     const int kNumArgsChecked = 1;
     ICData& ic_data = ICData::ZoneHandle();
@@ -940,11 +924,7 @@
   const int num_copied_params = parsed_function().num_copied_params();
   const int num_locals = parsed_function().num_stack_locals();
   __ Comment("Enter frame");
-  if (IsLeaf()) {
-    AssemblerMacros::EnterDartLeafFrame(assembler(), (StackSize() * kWordSize));
-  } else {
-    AssemblerMacros::EnterDartFrame(assembler(), (StackSize() * kWordSize));
-  }
+  AssemblerMacros::EnterDartFrame(assembler(), (StackSize() * kWordSize));
 
   // For optimized code, keep a bitmap of the frame in order to build
   // stackmaps for GC safepoints in the prologue.
@@ -1049,7 +1029,6 @@
                                      const ExternalLabel* label,
                                      PcDescriptors::Kind kind,
                                      LocationSummary* locs) {
-  ASSERT(!IsLeaf());
   __ call(label);
   AddCurrentDescriptor(kind, Isolate::kNoDeoptId, token_pos);
   RecordSafepoint(locs);
@@ -1061,7 +1040,6 @@
                                          const ExternalLabel* label,
                                          PcDescriptors::Kind kind,
                                          LocationSummary* locs) {
-  ASSERT(!IsLeaf());
   __ call(label);
   AddCurrentDescriptor(kind, deopt_id, token_pos);
   RecordSafepoint(locs);
@@ -1082,7 +1060,6 @@
 void FlowGraphCompiler::GenerateCallRuntime(intptr_t token_pos,
                                             const RuntimeEntry& entry,
                                             LocationSummary* locs) {
-  ASSERT(!IsLeaf());
   __ CallRuntime(entry);
   AddCurrentDescriptor(PcDescriptors::kOther, Isolate::kNoDeoptId, token_pos);
   RecordSafepoint(locs);
@@ -1096,7 +1073,6 @@
                                          intptr_t deopt_id,
                                          intptr_t token_pos,
                                          LocationSummary* locs) {
-  ASSERT(!IsLeaf());
   __ LoadObject(RBX, ic_data);
   __ LoadObject(R10, arguments_descriptor);
   GenerateDartCall(deopt_id,
@@ -1114,7 +1090,6 @@
                                        intptr_t deopt_id,
                                        intptr_t token_pos,
                                        LocationSummary* locs) {
-  ASSERT(!IsLeaf());
   __ LoadObject(RBX, function);
   __ LoadObject(R10, arguments_descriptor);
   if (function.HasCode()) {