Rename "NoBarrier" memory operations to "Relaxed".

src/execution.h

Index: src/execution.h
diff --git a/src/execution.h b/src/execution.h
index c6ea3847b8d4c9011b06281598b2d265a85216f2..9e62caf41cf3272ed1d8133f08e544383abb25dc 100644
--- a/src/execution.h
+++ b/src/execution.h
@@ -199,18 +199,18 @@ class V8_EXPORT_PRIVATE StackGuard final {
     base::AtomicWord climit_;
 
     uintptr_t jslimit() {
-      return bit_cast<uintptr_t>(base::NoBarrier_Load(&jslimit_));
+      return bit_cast<uintptr_t>(base::Relaxed_Load(&jslimit_));
     }
     void set_jslimit(uintptr_t limit) {
-      return base::NoBarrier_Store(&jslimit_,
-                                   static_cast<base::AtomicWord>(limit));
+      return base::Relaxed_Store(&jslimit_,
+                                 static_cast<base::AtomicWord>(limit));
     }
     uintptr_t climit() {
-      return bit_cast<uintptr_t>(base::NoBarrier_Load(&climit_));
+      return bit_cast<uintptr_t>(base::Relaxed_Load(&climit_));
     }
     void set_climit(uintptr_t limit) {
-      return base::NoBarrier_Store(&climit_,
-                                   static_cast<base::AtomicWord>(limit));
+      return base::Relaxed_Store(&climit_,
+                                 static_cast<base::AtomicWord>(limit));
     }
 
     PostponeInterruptsScope* postpone_interrupts_;