Remove inlining restriction of calls to the == operator.

runtime/vm/flow_graph_compiler_x64.cc

Index: runtime/vm/flow_graph_compiler_x64.cc
===================================================================
--- runtime/vm/flow_graph_compiler_x64.cc	(revision 27236)
+++ runtime/vm/flow_graph_compiler_x64.cc	(working copy)
@@ -1469,34 +1469,6 @@
 }
 
 
-// Implement equality spec: if any of the arguments is null do identity check.
-// Fallthrough calls super equality.
-void FlowGraphCompiler::EmitSuperEqualityCallPrologue(Register result,
-                                                      Label* skip_call) {
-  const Immediate& raw_null =
-      Immediate(reinterpret_cast<intptr_t>(Object::null()));
-  Label check_identity, fall_through;
-  __ cmpq(Address(RSP, 0 * kWordSize), raw_null);
-  __ j(EQUAL, &check_identity, Assembler::kNearJump);
-  __ cmpq(Address(RSP, 1 * kWordSize), raw_null);
-  __ j(NOT_EQUAL, &fall_through, Assembler::kNearJump);
-
-  __ Bind(&check_identity);
-  __ popq(result);
-  __ cmpq(result, Address(RSP, 0 * kWordSize));
-  Label is_false;
-  __ j(NOT_EQUAL, &is_false, Assembler::kNearJump);
-  __ LoadObject(result, Bool::True());
-  __ Drop(1);
-  __ jmp(skip_call);
-  __ Bind(&is_false);
-  __ LoadObject(result, Bool::False());
-  __ Drop(1);
-  __ jmp(skip_call);
-  __ Bind(&fall_through);
-}
-
-
 // This function must be in sync with FlowGraphCompiler::RecordSafepoint.
 void FlowGraphCompiler::SaveLiveRegisters(LocationSummary* locs) {
   // TODO(vegorov): consider saving only caller save (volatile) registers.