[liveedit] simplify source position recalculation.

src/debug/liveedit.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/debug/liveedit.h"
 
 #include "src/ast/scopeinfo.h"
 #include "src/ast/scopes.h"
 #include "src/code-stubs.h"
 #include "src/compilation-cache.h"
@@ skipping 1208 matching lines @@
           continue;
         }
       }
       if (RelocInfo::IsRealRelocMode(rinfo->rmode())) {
         buffer_writer.Write(it.rinfo());
       }
     }
   }
 
   Vector<byte> buffer = buffer_writer.GetResult();
+  Handle<ByteArray> reloc_info =
+      isolate->factory()->NewByteArray(buffer.length(), TENURED);
 
-  if (buffer.length() == code->relocation_size()) {
-    // Simply patch relocation area of code.
-    MemCopy(code->relocation_start(), buffer.start(), buffer.length());
-    return code;
-  } else {
-    // Relocation info section now has different size. We cannot simply
-    // rewrite it inside code object. Instead we have to create a new
-    // code object.
-    Handle<Code> result(isolate->factory()->CopyCode(code, buffer));
-    return result;
-  }
+  DisallowHeapAllocation no_gc;
+  code->set_relocation_info(*reloc_info);
+  CopyBytes(code->relocation_start(), buffer.start(), buffer.length());
+  return code;
 }
 
 void PatchPositionsInBytecodeArray(Handle<BytecodeArray> bytecode,
                                    Handle<JSArray> position_change_array) {
   Isolate* isolate = bytecode->GetIsolate();
   Zone zone(isolate->allocator());
   interpreter::SourcePositionTableBuilder builder(isolate, &zone);
 
   for (interpreter::SourcePositionTableIterator iterator(
            bytecode->source_position_table());
@@ skipping 814 matching lines @@
     scope_info_length++;
 
     current_scope = current_scope->outer_scope();
   }
 
   return scope_info_list;
 }
 
 }  // namespace internal
 }  // namespace v8