[heap] Reduce new space size in safepoint

New space size needs to be adjusted during global safepoint.

Bug: v8:10315
Change-Id: I670024faa55ce68a4091af6f358f45d20c66fa0b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2239573Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Dominik Inführ <dinfuehr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69301}

src/heap/heap.cc

@@ -1131,6 +1131,11 @@ void Heap::GarbageCollectionEpilogueInSafepoint() {
   if (FLAG_code_stats) ReportCodeStatistics("After GC");
   if (FLAG_check_handle_count) CheckHandleCount();
 #endif
+
+  {
+    TRACE_GC(tracer(), GCTracer::Scope::HEAP_EPILOGUE_REDUCE_NEW_SPACE);
+    ReduceNewSpaceSize();
+  }
 }
 
 void Heap::GarbageCollectionEpilogue() {
@@ -1173,11 +1178,6 @@ void Heap::GarbageCollectionEpilogue() {
 #endif  // DEBUG
 
   last_gc_time_ = MonotonicallyIncreasingTimeInMs();
-
-  {
-    TRACE_GC(tracer(), GCTracer::Scope::HEAP_EPILOGUE_REDUCE_NEW_SPACE);
-    ReduceNewSpaceSize();
-  }
 }
 
 class GCCallbacksScope {