Specialize breakpoint stubs by set of live registers of the stubs they are intercepting.

runtime/vm/assembler_x64.h

 // 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.
 
 #ifndef VM_ASSEMBLER_X64_H_
 #define VM_ASSEMBLER_X64_H_
 
 #ifndef VM_ASSEMBLER_H_
 #error Do not include assembler_x64.h directly; use assembler.h instead.
 #endif
@@ skipping 767 matching lines @@
   const ZoneGrowableArray<intptr_t>& GetPointerOffsets() const {
     return buffer_.pointer_offsets();
   }
   const GrowableObjectArray& object_pool() const { return object_pool_; }
 
   void FinalizeInstructions(const MemoryRegion& region) {
     buffer_.FinalizeInstructions(region);
   }
 
   // Index of constant pool entries pointing to debugger stubs.
-  static const int kBreakpointRuntimeCPIndex = 5;
+  static const int kICCallBreakpointCPIndex = 5;
+  static const int kClosureCallBreakpointCPIndex = 6;
+  static const int kRuntimeCallBreakpointCPIndex = 7;
 
   void LoadPoolPointer(Register pp);
 
   // Set up a Dart frame on entry with a frame pointer and PC information to
   // enable easy access to the RawInstruction object of code corresponding
   // to this frame.
   // The dart frame layout is as follows:
   //   ....
   //   locals space  <=== RSP
   //   saved PP
@@ skipping 277 matching lines @@
 }
 
 
 inline void Assembler::EmitOperandSizeOverride() {
   EmitUint8(0x66);
 }
 
 }  // namespace dart
 
 #endif  // VM_ASSEMBLER_X64_H_