[debuger/deoptimizer] Remove GC invocation

This CL removes a GC invocation which might not be needed anymore.

Change-Id: I27c57936677ba2ec0bc32588c485a2c3b6ffed01
Reviewed-on: https://chromium-review.googlesource.com/928241Reviewed-by: Yang Guo <yangguo@chromium.org>
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#51428}

src/debug/debug.cc

@@ -1141,10 +1141,6 @@ void Debug::DeoptimizeFunction(Handle<SharedFunctionInfo> shared) {
   // inlining.
   isolate_->AbortConcurrentOptimization(BlockingBehavior::kBlock);
 
-  // Make sure we abort incremental marking.
-  isolate_->heap()->CollectAllGarbage(Heap::kMakeHeapIterableMask,
-                                      GarbageCollectionReason::kDebugger);
-
   bool found_something = false;
   Code::OptimizedCodeIterator iterator(isolate_);
   while (Code* code = iterator.Next()) {