deps: v8: fix potential segfault in profiler

deps: v8: fix potential segfault in profiler · nodejs/node@f22132e

Original file line number	Diff line number	Diff line change
`@@ -146,8 +146,11 @@ class SamplingAllocationObserver : public AllocationObserver {`
`146`	`146`	`void Step(int bytes_allocated, Address soon_object, size_t size) override {`
`147`	`147`	`USE(heap_);`
`148`	`148`	`DCHECK(heap_->gc_state() == Heap::NOT_IN_GC);`
`149`		`-DCHECK(soon_object);`
`150`		`- profiler_->SampleObject(soon_object, size);`
	`149`	`+if (soon_object) {`
	`150`	`+// TODO(ofrobots): it would be better to sample the next object rather`
	`151`	`+// than skipping this sample epoch if soon_object happens to be null.`
	`152`	`+ profiler_->SampleObject(soon_object, size);`
	`153`	`+ }`
`151`	`154`	`}`
`152`	`155`
`153`	`156`	`intptr_t GetNextStepSize() override { return GetNextSampleInterval(rate_); }`