Make safe points in generated code invisible to the debugger

runtime/vm/flow_graph_compiler_x64.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"  // Needed here to get TARGET_ARCH_X64.
 #if defined(TARGET_ARCH_X64)
 
 #include "vm/flow_graph_compiler.h"
 
 #include "vm/ast_printer.h"
@@ skipping 1429 matching lines @@
   }
 
   if (needs_number_check) {
     __ pushq(reg);
     __ PushObject(obj, PP);
     if (is_optimizing()) {
       __ CallPatchable(&StubCode::OptimizedIdenticalWithNumberCheckLabel());
     } else {
       __ CallPatchable(&StubCode::UnoptimizedIdenticalWithNumberCheckLabel());
     }
-    AddCurrentDescriptor(PcDescriptors::kRuntimeCall,
-                         Isolate::kNoDeoptId,
-                         token_pos);
+    if (token_pos != Scanner::kDummyTokenIndex) {
+      AddCurrentDescriptor(PcDescriptors::kRuntimeCall,
+                           Isolate::kNoDeoptId,
+                           token_pos);
+    }
     __ popq(reg);  // Discard constant.
     __ popq(reg);  // Restore 'reg'.
     return;
   }
 
   __ CompareObject(reg, obj, PP);
 }
 
 
 void FlowGraphCompiler::EmitEqualityRegRegCompare(Register left,
                                                   Register right,
                                                   bool needs_number_check,
                                                   intptr_t token_pos) {
   if (needs_number_check) {
     __ pushq(left);
     __ pushq(right);
     if (is_optimizing()) {
       __ CallPatchable(&StubCode::OptimizedIdenticalWithNumberCheckLabel());
     } else {
       __ CallPatchable(&StubCode::UnoptimizedIdenticalWithNumberCheckLabel());
     }
-    AddCurrentDescriptor(PcDescriptors::kRuntimeCall,
-                         Isolate::kNoDeoptId,
-                         token_pos);
+    if (token_pos != Scanner::kDummyTokenIndex) {
+      AddCurrentDescriptor(PcDescriptors::kRuntimeCall,
+                           Isolate::kNoDeoptId,
+                           token_pos);
+    }
     // Stub returns result in flags (result of a cmpl, we need ZF computed).
     __ popq(right);
     __ popq(left);
   } else {
     __ cmpl(left, right);
   }
 }
 
 
 // This function must be in sync with FlowGraphCompiler::RecordSafepoint and
@@ skipping 360 matching lines @@
   __ movups(reg, Address(RSP, 0));
   __ AddImmediate(RSP, Immediate(kFpuRegisterSize), PP);
 }
 
 
 #undef __
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_X64