src: Update trace event macros to V8 5.7 version

src/tracing/trace_event.h was updated by applying the following changes:

1. Include src/tracing/trace_event_common.h instead of the one from v8 base.

2. Replace all instances of base::Atomic with intptr_t (trace events can only be generated from the main thread for now).

3. Replace instances of V8_INLINE with inline.

4. Eliminate uses of DCHECK.

5. Eliminate uses of V8_UNLIKELY, the branch predictor should be good enough alone.

6. Change the namespace used by trace_event.h from v8::internal::tracing to node::tracing.

7. Remove CallStatsScopedTracer class and related macros (they rely on V8 implementation details).

8. Change ConvertableToTraceFormat to v8::ConvertableToTraceFormat.

9. Add function "static void SetCurrentPlatform(v8::Platform* platform);" to the declaration of TraceEventHelper.

Checklist

• make -j4 test (UNIX), or vcbuild test (Windows) passes
• commit message follows commit guidelines

Affected core subsystem(s)

src, tracing