[heap] Move LocalHeap::IsSafepointRequested into header

This will allow inlining of this function.

Bug: v8:10315
Change-Id: I6b9db641b00e215cf58b82a9a9a5cf9e676f3f02
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2323354
Commit-Queue: Dominik Inführ <dinfuehr@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69116}

src/heap/local-heap.cc

@@ -107,10 +107,6 @@ void LocalHeap::RequestSafepoint() {
   safepoint_requested_.store(true, std::memory_order_relaxed);
 }
 
-bool LocalHeap::IsSafepointRequested() {
-  return safepoint_requested_.load(std::memory_order_relaxed);
-}
-
 void LocalHeap::Safepoint() {
   if (IsSafepointRequested()) {
     ClearSafepointRequested();

src/heap/local-heap.h

@@ -89,7 +89,9 @@ class V8_EXPORT_PRIVATE LocalHeap {
 
   void EnsurePersistentHandles();
 
-  bool IsSafepointRequested();
+  V8_INLINE bool IsSafepointRequested() {
+    return safepoint_requested_.load(std::memory_order_relaxed);
+  }
   void ClearSafepointRequested();
 
   void EnterSafepoint();