Don't use LOG() from platform.

src/platform-macos.cc

Index: src/platform-macos.cc
diff --git a/src/platform-macos.cc b/src/platform-macos.cc
index e7a89f2e3ee0c83618496ae0be429304c97cd839..6535d274b0eac80a9446288946eda1ec0649b4bb 100644
--- a/src/platform-macos.cc
+++ b/src/platform-macos.cc
@@ -61,10 +61,7 @@ void* OS::Allocate(const size_t requested,
                      MAP_PRIVATE | MAP_ANON,
                      kMmapFd,
                      kMmapFdOffset);
-  if (mbase == MAP_FAILED) {
-    LOG(Isolate::Current(), StringEvent("OS::Allocate", "mmap failed"));
-    return NULL;
-  }
+  if (mbase == MAP_FAILED) return NULL;
   *allocated = msize;
   return mbase;
 }