Format stack layout comments for X64

src/x64/macro-assembler-x64.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 627 matching lines @@
 
   CEntryStub stub(1);
   CallStub(&stub);
 }
 
 
 void MacroAssembler::TailCallExternalReference(const ExternalReference& ext,
                                                int num_arguments,
                                                int result_size) {
   // ----------- S t a t e -------------
-  //  -- rsp[0] : return address
-  //  -- rsp[8] : argument num_arguments - 1
+  //  -- rsp[0]                 : return address
+  //  -- rsp[8]                 : argument num_arguments - 1
   //  ...
   //  -- rsp[8 * num_arguments] : argument 0 (receiver)
   // -----------------------------------
 
   // TODO(1236192): Most runtime routines don't need the number of
   // arguments passed in because it is constant. At some point we
   // should remove this need and make the runtime routine entry code
   // smarter.
   Set(rax, num_arguments);
   JumpToExternalReference(ext, result_size);
@@ skipping 4067 matching lines @@
   j(greater, &no_info_available);
   CompareRoot(MemOperand(scratch_reg, -AllocationSiteInfo::kSize),
               Heap::kAllocationSiteInfoMapRootIndex);
   bind(&no_info_available);
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64