ppc: fixing ThreadId on ppc

Fixing ThreadId according to the following changes:
656254b1

Change-Id: I1e1943ac7e3ed03799c213e566816bfe5c21967d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1512718Reviewed-by: Junliang Yan <jyan@ca.ibm.com>
Commit-Queue: Milad Farazmand <miladfar@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#60159}

src/ppc/simulator-ppc.cc

@@ -3982,7 +3982,7 @@ void Simulator::GlobalMonitor::NotifyStore(uintptr_t addr, TransactionSize size,
         tagged_addr_ + static_cast<uintptr_t>(size_);
     bool is_not_overlapped = transaction_end < exclusive_transaction_start ||
                              exclusive_transaction_end < transaction_start;
-    if (!is_not_overlapped && !thread_id_.Equals(thread_id)) {
+    if (!is_not_overlapped && thread_id_ != thread_id) {
       Clear();
     }
   }
@@ -3993,7 +3993,7 @@ bool Simulator::GlobalMonitor::NotifyStoreExcl(uintptr_t addr,
                                                ThreadId thread_id) {
   bool permission = access_state_ == MonitorAccess::Exclusive &&
                     addr == tagged_addr_ && size_ == size &&
-                    thread_id_.Equals(thread_id);
+                    thread_id_ == thread_id;
   // The reservation is cleared if the processor holding the reservation
   // executes a store conditional instruction to any address.
   Clear();