Revert "[debuger/deoptimizer] Remove GC invocation"

This reverts commit a7c78631.

Reason for revert:
https://build.chromium.org/p/client.v8.fyi/builders/V8-Blink%20Linux%2064/builds/21788

See: https://github.com/v8/v8/wiki/Blink-layout-tests

Original change's description:
> [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/928241
> Reviewed-by: Yang Guo <yangguo@chromium.org>
> Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#51428}

TBR=yangguo@chromium.org,sigurds@chromium.org

Change-Id: Ifff9fdd060f7792208dfa01901836a1845b67bde
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/929661Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#51450}

src/debug/debug.cc

@@ -1141,6 +1141,10 @@ 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()) {