[diagnostics] Fix os macros for mac as well

Bug: chromium:1196278
Change-Id: If80b1264f537e3828867831ac4d4dfc005a1ae8d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2845243
Auto-Submit: Nico Weber <thakis@chromium.org>
Reviewed-by: Dan Elphick <delphick@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#74149}

BUILD.gn

@@ -4830,7 +4830,7 @@ v8_component("v8_libplatform") {
   } else if (is_win) {
     sources -= [ "src/libplatform/tracing/recorder-default.cc" ]
     sources += [ "src/libplatform/tracing/recorder-win.cc" ]
-  } else if (target_os == "mac") {
+  } else if (is_mac) {
     sources -= [ "src/libplatform/tracing/recorder-default.cc" ]
     sources += [ "src/libplatform/tracing/recorder-mac.cc" ]
   }

src/libplatform/tracing/recorder.h

@@ -9,7 +9,7 @@
 
 #include "include/libplatform/v8-tracing.h"
 
-#ifdef V8_TARGET_OS_MACOSX
+#ifdef V8_OS_MACOSX
 #if !defined(V8_ENABLE_SYSTEM_INSTRUMENTATION)
 #error V8_ENABLE_SYSTEM_INSTRUMENTATION is not defined
 #endif
@@ -49,7 +49,7 @@ class V8_PLATFORM_EXPORT Recorder {
   void AddEvent(TraceObject* trace_event);
 
  private:
-#ifdef V8_TARGET_OS_MACOSX
+#ifdef V8_OS_MACOSX
   os_log_t v8Provider;
 #endif
 };
@@ -58,7 +58,7 @@ class V8_PLATFORM_EXPORT Recorder {
 }  // namespace platform
 }  // namespace v8
 
-#ifdef V8_TARGET_OS_MACOSX
+#ifdef V8_OS_MACOSX
 #pragma clang diagnostic pop
 #endif