Fix AddBlock invocations in CpuProfilesCollection.

src/platform-linux.cc

Index: src/platform-linux.cc
diff --git a/src/platform-linux.cc b/src/platform-linux.cc
index ff1ecb13ce8c55e32f28fceca6a510022456a417..7e8a5586f80e45b8529e77e8bcff7ab8a38aeae9 100644
--- a/src/platform-linux.cc
+++ b/src/platform-linux.cc
@@ -177,7 +177,8 @@ LinuxKernelMemoryBarrierFunc pLinuxKernelMemoryBarrier __attribute__((weak)) =
 #endif
 
 void OS::ReleaseStore(volatile AtomicWord* ptr, AtomicWord value) {
-#if defined(V8_TARGET_ARCH_ARM) && defined(__arm__)  // don't use on a simulator
+#if defined(V8_TARGET_ARCH_ARM) && defined(__arm__)
+  // Only use on ARM hardware.
   pLinuxKernelMemoryBarrier();
 #else
   __asm__ __volatile__("" : : : "memory");