Split out libplatform into a separate libary

tools/parser-shell.cc

Index: tools/parser-shell.cc
diff --git a/tools/parser-shell.cc b/tools/parser-shell.cc
index dbac64ab8f226c1cdc8c6ae3f406b14834ba6eac..2dae0558b89c8746cad8f199268b0c479ef96ea7 100644
--- a/tools/parser-shell.cc
+++ b/tools/parser-shell.cc
@@ -33,6 +33,7 @@
 #include <vector>
 #include "src/v8.h"
 
+#include "include/libplatform/libplatform.h"
 #include "src/api.h"
 #include "src/compiler.h"
 #include "src/scanner-character-streams.h"
@@ -121,6 +122,9 @@ std::pair<v8::base::TimeDelta, v8::base::TimeDelta> RunBaselineParser(
 
 int main(int argc, char* argv[]) {
   v8::V8::InitializeICU();
+  v8::Platform* platform = v8::platform::CreateDefaultPlatform(
+      v8::base::OS::NumberOfProcessorsOnline());
+  v8::V8::InitializePlatform(platform);
   v8::V8::SetFlagsFromCommandLine(&argc, argv, true);
   Encoding encoding = LATIN1;
   std::vector<std::string> fnames;
@@ -168,5 +172,7 @@ int main(int argc, char* argv[]) {
     }
   }
   v8::V8::Dispose();
+  v8::V8::ShutdownPlatform();
+  delete platform;
   return 0;
 }