Add basic C++ implementation of CPU profiler.

src/platform.h

Index: src/platform.h
diff --git a/src/platform.h b/src/platform.h
index 8f6876633626fe4c18e56a77f90148c96edbc318..f124cf157158c643aed52a993415d03dfb221e81 100644
--- a/src/platform.h
+++ b/src/platform.h
@@ -529,7 +529,7 @@ class TickSample {
   Address function;  // The last called JS function.
   StateTag state;  // The state of the VM.
   static const int kMaxFramesCount = 100;
-  EmbeddedVector<Address, kMaxFramesCount> stack;  // Call stack.
+  Address stack[kMaxFramesCount];  // Call stack.
   int frames_count;  // Number of captured frames.
 };