Remove unused StackGuard::HandleGCInterrupt API.

Change-Id: I58f3eb9259822650a3b31010213e3df030821be2
Reviewed-on: https://chromium-review.googlesource.com/1042187Reviewed-by: Hannes Payer <hpayer@chromium.org>
Commit-Queue: Wez <wez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#52980}

src/execution.cc

@@ -493,13 +493,6 @@ void StackGuard::InitThread(const ExecutionAccess& lock) {
 // --- C a l l s   t o   n a t i v e s ---
 
 
-void StackGuard::HandleGCInterrupt() {
-  if (CheckAndClearInterrupt(GC_REQUEST)) {
-    isolate_->heap()->HandleGCRequest();
-  }
-}
-
-
 Object* StackGuard::HandleInterrupts() {
   if (FLAG_verify_predictable) {
     // Advance synthetic time by making a time request.

src/execution.h

@@ -135,7 +135,6 @@ class V8_EXPORT_PRIVATE StackGuard final {
   // If the stack guard is triggered, but it is not an actual
   // stack overflow, then handle the interruption accordingly.
   Object* HandleInterrupts();
-  void HandleGCInterrupt();
 
  private:
   StackGuard();