Revert "[heap] Refactor Heap::PerformGarbageCollection"

This reverts commit d0dbee47.

Reason for revert: Breaks MSVC bot (https://cr-buildbucket.appspot.com/build/8880517266974148704)

Original change's description:
> [heap] Refactor Heap::PerformGarbageCollection
> 
> This ensures that PerformGarbageCollection runs completely within a
> LocalHeap safepoint. External prologues and epilogues that may trigger
> GC and run JS are moved outside.
> 
> Bug: v8:10315
> 
> Change-Id: I5c0081f0791ba5d27152c119a2a0d454056656d3
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2190756
> Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
> Reviewed-by: Dominik Inführ <dinfuehr@chromium.org>
> Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#67736}

TBR=ulan@chromium.org,mlippautz@chromium.org,dinfuehr@chromium.org

Change-Id: I62e62d3f4cd50a3e8f0037902f158baef68cb3b1
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:10315
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2195823Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67739}

src/heap/heap.h

@@ -1635,9 +1635,10 @@ class Heap {
   // over all objects.  May cause a GC.
   void MakeHeapIterable();
 
-  // Performs garbage collection in a safepoint.
-  // Returns the number of freed global handles.
-  size_t PerformGarbageCollection(
+  // Performs garbage collection
+  // Returns whether there is a chance another major GC could
+  // collect more garbage.
+  bool PerformGarbageCollection(
       GarbageCollector collector,
       const GCCallbackFlags gc_callback_flags = kNoGCCallbackFlags);