Revert 11927 "Fix liveedit heap traversal bug with write barrier"

src/liveedit.cc

Index: src/liveedit.cc
diff --git a/src/liveedit.cc b/src/liveedit.cc
index d99c4a07ed31fd0bbed7db9e15682385cef2af6a..80e18bbbff9a9274e04f6fdd628aa671d414516b 100644
--- a/src/liveedit.cc
+++ b/src/liveedit.cc
@@ -968,14 +968,6 @@ class ReplacingVisitor : public ObjectVisitor {
 static void ReplaceCodeObject(Code* original, Code* substitution) {
   ASSERT(!HEAP->InNewSpace(substitution));
 
-  // Perform a full GC in order to ensure that we are not in the middle of an
-  // incremental marking phase when we are replacing the code object.
-  // Since we are not in an incremental marking phase we can write pointers
-  // to code objects (that are never in new space) without worrying about
-  // write barriers.
-  HEAP->CollectAllGarbage(Heap::kMakeHeapIterableMask,
-                          "liveedit.cc ReplaceCodeObject");
-
   AssertNoAllocation no_allocations_please;
 
   ReplacingVisitor visitor(original, substitution);